Evaluation of a behavioral assessment questionnaire for use in the characterization of behavioral problems of dogs relinquished to animal shelters

OBJECTIVE: To evaluate a behavioral intake questionnaire in animal shelters for the presence of biased results and assess its use in the characterization of behavioral problems of dogs relinquished to shelters. DESIGN: Cross-sectional study. Animals-54 dogs being relinquished to a shelter and 784 dogs belonging to veterinary clients. Procedure-Owners who were relinquishing their dogs and agreed to complete the behavioral questionnaire were alternately assigned to 1 of 2 groups; participants were aware that information provided would be confidential or nonconfidential (i.e., likely used for adoption purposes). Data from confidential and nonconfidential information groups were compared, and the former were compared with data (collected via the questionnaire) regarding a population of client-owned dogs. RESULTS: Analyses revealed significant differences in 2 areas of reported problem behavior between the confidential and nonconfidential information groups: owner-directed aggression and stranger-directed fear. Compared with client-owned-group data, significantly more relinquished shelter dogs in the confidential information group were reported to have owner-directed aggression, stranger-directed aggression, dog-directed aggression or fear, stranger-directed fear, nonsocial fear, and separation-related behaviors. CONCLUSIONS AND CLINICAL RELEVANCE: Among persons relinquishing dogs to a shelter, those who believed questionnaire responses were confidential reported owner-directed aggression and fear of strangers in their pets more frequently than relinquishers who believed responses were nonconfidential. Confidentiality had no apparent effect on the reporting of other assessed behavioral problems. Results suggest that behavioral questionnaires may sometimes provide inaccurate information in a shelter setting, but the information may still be useful when evaluating behavior of relinquished dogs.     

Comparison of behavioral characteristics of dogs in the United States and Japan

This study examined the difference in dog owning between Japan and the United States, and the effect of these differences on dogs’ behavioral characteristics. Behavioral evaluations of privately-owned dogs were obtained by using online questionnaire. We compared background and demographic information from the two countries and analyzed the effects of these differences on behavioral characteristics in dogs. The results indicated that there was a bias in the dog breeds kept in Japan compared to the United States and that Japanese dogs’ body weight was lower than the US dogs. The main source of dog acquisition was pet stores in Japan and breeders and/or shelters in the United States. Multiple linear regression analysis found that Japanese dogs showed more aggression to household members and higher energy, restlessness and fear of non-social stimuli than US dogs, while US dogs showed more fear of unfamiliar persons, separation-related behavior and excitability. US dogs also showed higher levels of trainability and attachment to owners. The lower dog’s body weight was, the higher the behavioral scores except for trainability were. When dogs that were obtained under 3 months of age were analyzed, the younger the dogs were when their owners obtained them, the higher the scores on some behavioral problem factors were. The higher rates of problem behaviors among Japanese dogs compared with US dogs suggest that the preference for small breed dogs and poor early development environment influenced the behavioral characteristics of dogs.     

Effects of exercise and human contact on animal welfare in a dog shelter

The aim of the study is to investigate the reduction of stress in dogs in municipal shelters through easy-to-implement activities, ie, 25-minute sessions of exercise and human contact, that do not require a significant investment in terms of funding, staff or time. The results demonstrate that the dogs taking part in these sessions have lower salivary cortisol levels (F=121.42; P<0.05) and achieve better scores on a behaviour test (t(17)=4.27; P=0.001). It can therefore be affirmed that the exercise and human contact protocol proposed in the present study diminishes stress and improves the welfare of dogs housed in shelters.     

Diagnostic, treatment, and prevention protocols for canine heartworm infection in animal sheltering agencies

The high prevalence of heartworm infection in shelter dogs creates a dilemma for shelter managers, who frequently operate with insufficient funding, staffing, and expertise to comply with heartworm guidelines developed for owned pet dogs. The purpose of this study was to survey canine heartworm management protocols used by 504 animal sheltering agencies in the endemic states of Alabama, Florida, Georgia, and Mississippi. Open-admission shelters, which tended to be larger and more likely to perform animal control functions, were less likely (41%) to test all adult dogs than were limited-admission shelters (80%), which tended to be smaller non-profit humane agencies, and foster programs (98%) based out of private residences. Open-admission shelters were more likely to euthanize infected dogs (27%) or to release them without treatment (39%), whereas limited-admission shelters and foster programs were more likely to provide adulticide therapy (82% and 89%, respectively). Of the 319 agencies that treated infections, 44% primarily used a standard two-dose melarsomine protocol, and 35% primarily used a three-dose split-treatment melarsomine protocol. Long-term low-dose ivermectin was the most common treatment used in 22% of agencies. Open-admission shelters were less likely (35%) to provide preventive medications for all dogs than were limited-admission shelters (82%) and foster programs (97%). More agencies used preventives labeled for monthly use in dogs (60%) than ivermectin products labeled for livestock (38%). The most common reason diagnostic testing and preventive medication was not provided was cost. These results indicate a lack of protocol uniformity among agencies and insufficient resources to identify, treat, and prevent infection. Sheltering agencies and companion animal health industries should develop guidelines that are feasible for use in sheltering agencies and provide improved access to preventive and treatment strategies for management of Dirofilaria immitis.     

National survey of owner-directed aggression in English Springer Spaniels

OBJECTIVE: To determine prevalence of owner-directed aggression and identify associated environmental and genetic factors in English Springer Spaniels. DESIGN: Prevalence survey. ANIMALS: 1,053 adult English Springer Spaniels. PROCEDURE: A mail survey was sent to 2,400 randomly selected owners of adult American Kennel Club-registered English Springer Spaniels. Dogs with a history of aggression to family members and familiar humans were compared with dogs without such a history. RESULTS: 1,053 questionnaires (56.1% of the 1,877 delivered) were completed. A history of owner-directed growling or more intense aggression was reported in 510 (48.4%) dogs. Two hundred seventy-seven (26.3%) dogs had bitten a human in the past; 65.2% of bites were directed at familiar (owner or nonowner) adults and children. Variables associated with owner-directed aggression included sex of dog (male), neuter status (neutered, regardless of sex), show or bench lines, age > 4 years, aggression to unfamiliar adults and children, acquisition from a hobby breeder, less responsiveness to obedience cues, and a specific kennel and 1 popular sire from that kennel in a 4-generation pedigree. CONCLUSIONS AND CLINICAL RELEVANCE: Owner-directed aggression in adult English Springer Spaniels was associated with a number of environmental, sex-related, and inherited factors. To reduce the risk of aggression, prospective owners might seek a female, hunting-type English Springer Spaniel from an experienced breeder. However, because risk factors are broad and varied, there are limitations to the extent to which behavior can be predicted and further study is needed of the inheritance of aggression in this breed.     

Effects of clomipramine hydrochloride on dominance-related aggression in dogs.

OBJECTIVE: To compare effects of the serotonergic drug clomipramine hydrochloride with those of placebo for treatment of dominance-related aggression in dogs. DESIGN: Randomized, placebo-controlled, double-blind clinical trial. ANIMALS: 28 neutered dogs > 1 year old with dominance-related aggression. PROCEDURE: Dogs displaying > or = 3 aggressive episodes/wk toward > or = 1 human family member in response to identifiable behavioral triggers were included in the study. Owners were instructed not to change patterns of interaction with their dogs during the study. After 2 weeks of baseline observations, dogs were treated for 6 weeks with clomipramine (1.5 mg/kg [0.7 mg/lb] of body weight, q 12 h; n = 15) or placebo (13). Responses to triggers were assigned the following aggression scores: no response, 0; growl or lip curl, 1; snap or bite, 2. Mean scores for responses to triggers were obtained during the 2-week pretreatment period (baseline) and during the first and second weeks, third and fourth weeks, and fifth and sixth weeks of treatment. At the end of the study, owners assigned a score designed to evaluate their overall perceived change in aggressiveness; this was referred to as the global score. RESULTS: Mean aggression scores decreased at the fifth and sixth week of treatment in both groups, compared with baseline scores. However, mean scores between groups were not different. Global scores, assigned by the owner, generally reflected changes in mean aggression scores. CONCLUSIONS AND CLINICAL RELEVANCE: Compared with placebo, clomipramine administered to dogs at the dosage recommended for treatment of separation anxiety did not reduce aggressiveness toward human family members.     

Behavioral evaluation of 65 aggressive dogs following a reported bite event

Peer-reviewed scientific publications on the topic of dog bites are numerous. Montreal was one of the first municipalities in the province of Quebec to require mandatory assessment of aggressive dogs by veterinarians. In 2019, dogs reported as aggressive and considered a potential risk to public safety by city officials were scheduled for a mandatory behavioral assessment by a veterinarian. For the purpose of this study, only aggressive dogs that had bitten (N = 65) were included. The goals were to better describe the aggressive behavior of these dogs (behavioral sequence, type of aggression, and overall reactivity) and perhaps identify new possible risk factors related to severity of injury and dangerousness. The number of signs of increased arousal/reactivity was positively and significantly associated with the injury severity score. Dangerousness increased with size of dogs. Entire males were most dangerous despite absence of recognizable differences in body weight between neutered and unneutered males.     

Determinants of adoption and euthanasia of shelter dogs spayed or neutered in the university of california veterinary student surgery program compared to other shelter dogs

Limited economic resources and pet overpopulation force animals shelters to consider euthanasia of adoptable animals every day. Veterinary medical schools can play a positive role in increasing pet adoption and combating overpopulation by providing free neutering for shelter animals. This retrospective cohort study illustrated that the cooperative efforts of a veterinary medicine surgical teaching program and local animal shelters decreases euthanasia of adoptable pets. At the University of California, Davis (UCD), shelter dogs are neutered by veterinary students and then returned to the shelter for adoption. The rates of adoption and euthanasia of the dogs neutered at UCD were contrasted with a comparison shelter group to determine the effect of pre-adoption neutering. The UCD-neutered dogs had a lower rate of euthanasia than the comparison shelter group at the shelters investigated. At Sacramento County Animal Care and Regulation, 73% of the UCD group but only 36% of the comparison group were adopted. At Yolo County Animal Services, 71% of the UCD group and 45% of the comparison group were adopted. The sex of an animal did not significantly affect the rate of euthanasia. Dogs that were predominantly pit bull, rottweiler, or chow chow breeds had higher rates of euthanasia than other breeds, independent of neuter status. Also, juveniles (less than one year old) had lower rates of euthanasia than adults, independent of neuter status. UCD adult dogs had lower rates of euthanasia than comparison adults. Post-surgical UCD dogs spent a longer average time in the shelter before adoption (15 days at Sacramento; 16 days at Yolo) than the comparison dogs (11 and 12 days, respectively). UCD dogs also spent a longer average time in the shelter before euthanasia (18 and 25 days, respectively) than the comparison dogs (13 days at both shelters). Lower probabilities of euthanasia for behavioral or medical reasons were found for UCD dogs than for the comparison dogs. The probability of euthanasia for reasons of space limitations increased with time in shelter for both groups. In this study, pre-adoption neutering increased adoptions without increasing the probability of medical or behavioral euthanasia.     

Behavioral characteristics of English Cocker Spaniels with owner-defined aggressive behavior

Information on the behavior of both aggressive and nonaggressive (control) English cocker spaniels (ECS) recruited for genetic analysis is presented. Information from a total of 122 dogs was gathered using questionnaires and owner interviews, resulting in analysis of 52 aggressive (5 aggressive dogs were excluded from the analysis) and 65 control dogs. Owners rated their dogs with 5-point frequency scales for unacceptable behavior toward humans (17 items), fear (20 items), barking (8 items), and aggression toward other dogs (4 items). The results show that serious, repeated growling is the most pronounced single behavior characterizing the aggressive ECS, and this seems to be the most important behavior causing owners to classify their dogs as aggressive. The other main behavior characteristic of the aggressive group was skin-penetrating bites. Snapping and “biting in general” were also frequently reported among these dogs. The objective of this study was to describe some behavioral characteristics of ECS showing owner-defined aggressive behavior, and behavioral differences between these dogs and a group of ECS with excellent behavior.     

Gonadectomy in immature dogs: effects on skeletal, physical, and behavioral development

In a 15-month study, the effects of prepubertal gonadectomy on skeletal growth, weight gain, food intake, body fat, secondary sex characteristics, and behavioral development were investigated in 32 mixed-breed dogs. Male and female pups from 5 litters were randomly allotted to 3 groups: group I, neuter at 7 weeks (n = 14); group II, neuter at 7 months (n = 8); and group III, sexually intact dogs (n = 10). Growth plate closure was delayed (group I vs group III; P less than 0.000001; group II vs group III, P less than 0.000001) in all neutered dogs, as compared with sexually intact dogs. Growth plate closure was delayed longer (group I vs group II, P less than 0.000045) in dogs neutered at 7 weeks old, compared with dogs neutered at 7 months old. The rate of growth was unaffected by gonadectomy, but the extended growth period resulted in greater final radial/ulnar length in all male dogs and bitches neutered at 7 weeks. Gonadectomy did not influence food intake, weight gain, or back-fat depth. Penile development was immature in the adult group-I males (mean +/- SEM diameter of pars glandis = 11.1 +/- 1.0 mm), compared with adult group-II (16.3 +/- 0.5 mm) and group-III (21.0 +/- 2.2 mm) males. Subjectively, the prepuce and os penis of the group-I males were immature, compared with those of group-II and group-III males. Vulvar development in group-I and group-II bitches was less mature than vulvar development in the sexually intact bitches. Of 7 behavioral characteristics assessed, only general activity and excitability rated differently among treatment groups. All neutered dogs were judged to be more active (group I, P less than 0.004) than sexually intact dogs. Group-I males were judged to be more excitable (P less than 0.02) than group-III males. It was concluded that with respect to skeletal, physical, and behavioral development, the effect of neutering pups at 7 weeks old was similar to that of neutering pups at 7 months old.     

Long-term outcome of gonadectomy performed at an early age or traditional age in dogs

OBJECTIVE: To determine long-term results and complications of gonadectomy performed at an early age (prepubertal) or at the traditional age in dogs. DESIGN: Cohort study. ANIMALS: 269 dogs from animal shelters. PROCEDURE: Dogs that underwent gonadectomy were allotted to 2 groups on the basis of estimated age at surgery (traditional age, > or =24 weeks old; prepubertal, < 24 weeks old). Adoptive owner information was obtained from shelter records, and telephone interviews were conducted with owners to determine physical or behavioral problems observed in the dogs since adoption. Follow-up information was obtained from attending veterinarians for dogs with complex problems or when owners were uncertain regarding the exact nature of their dog's problem. RESULTS: Prepubertal gonadectomy did not result in an increased incidence of behavioral problems or problems associated with any body system, compared with traditional-age gonadectomy, during a median follow-up period of 48 months after gonadectomy. Rate of retention in the original adoptive household was the same for dogs that underwent prepubertal gonadectomy as those that underwent traditional-age gonadectomy. Infectious diseases, however, were more common in dogs that underwent prepubertal gonadectomy. CONCLUSIONS AND CLINICAL IMPLICATIONS: With the exception of infectious diseases, prepubertal gonadectomy may be safely performed in dogs without concern for increased incidence of physical or behavioral problems during at least a 4-year period after gonadectomy.     

Effects of preadoption counseling for owners on house-training success among dogs acquired from shelters

OBJECTIVE: To determine the effect of preadoption counseling for owners on house-training success among dogs acquired from shelters. DESIGN: Prospective study. SAMPLE POPULATION: 113 dog owners. PROCEDURES: Participants were randomly assigned to a treatment (n = 54) or a control (59) group. Dog owners in the treatment group received counseling (5 minutes' duration) regarding house-training. Owners in the control group did not receive counseling, but all other adoption procedures were otherwise identical to those applied to the treatment group. All participants were contacted by telephone 1 month after adoption of a dog for assessment of house-training status and related issues by use of a standardized survey method; data were compared between groups. RESULTS: Most shelter dogs were considered successfully house-trained by their owners 1 month after adoption. Furthermore, dogs were considered house-trained by significantly more owners who received preadoption counseling than control group owners (98.1% vs 86.4%). Owners who received counseling used verbal punishment on their dogs during house-training less frequently and applied enzymatic cleaners to urine- or feces-soiled areas more frequently than owners in the control group. CONCLUSIONS AND CLINICAL RELEVANCE: Results have suggested that brief preadoption counseling for owners enhances successful house-training of dogs adopted from shelters. Counseling owners at the time of pet acquisition may thus have beneficial effects in the prevention of inappropriate elimination behaviors. Veterinarians and animal care staff should be encouraged to devote time to counsel new pet owners on successful house-training, as well as other healthcare and behavioral needs.     

Effect of dietary protein content and tryptophan supplementation on dominance aggression, territorial aggression, and hyperactivity in dogs

OBJECTIVE: To evaluate the effect of high- and low-protein diets with or without tryptophan supplementation on behavior of dogs with dominance aggression, territorial aggression, and hyperactivity. DESIGN: Prospective crossover study. ANIMALS: 11 dogs with dominance aggression, 11 dogs with territorial aggression, and 11 dogs with hyperactivity. PROCEDURE: In each group, 4 diets were fed for 1 weeks each in random order with a transition period of not < 3 days between each diet. Two diets had low protein content (approximately 18%), and 2 diets had high protein content (approximately 30%). Two of the diets (1 low-protein and 1 high-protein) were supplemented with tryptophan. Owners scored their dog's behavior daily by use of customized behavioral score sheets. Mean weekly values of 5 behavioral measures and serum concentrations of serotonin and tryptophan were determined at the end of each dietary period. RESULTS: For dominance aggression, behavioral scores were highest in dogs fed unsupplemented high-protein rations. For territorial aggression, [corrected] tryptophan-supplemented low-protein diets were associated with significantly lower behavioral scores than low-protein diets without tryptophan supplements. CONCLUSIONS AND CLINICAL RELEVANCE: For dogs with dominance aggression, the addition of tryptophan to high-protein diets or change to a low-protein diet may reduce aggression. For dogs with territorial aggression, tryptophan supplementation of a low-protein diet may be helpful in reducing aggression.     

Efficacy of 65% permethrin applied to dogs as a spot-on against Phlebotomus perniciosus

Leishmania infantum is a protozoan parasite causing leishmaniosis, a visceral disease transmitted by the bites of sand flies. As the main reservoir of the parasite, dogs are the principal targets of control measures against this disease, which affects both humans and dogs. Several studies have revealed the usefulness of topical insecticide treatment (collars, spot-ons and sprays) in reducing the incidence and prevalence of L. infantum. The present study was designed to test the efficacy of 65% permethrin applied to dogs as a spot-on against the sand fly vector Phlebotomus perniciosus. The duration of the desired effects was also estimated to help design an optimal treatment regimen. Twelve dogs assigned to treatment (n=6) and control (n=6) groups were exposed to sand flies once a week over a seven-week period. Repellent and insecticidal efficacies were estimated and compared amongst the groups. Our findings indicate satisfactory repellent, or anti-feeding, effects lasting 3 weeks and short-term insecticidal effects lasting 2 weeks after initial application. Accordingly, we recommend the use of this product every 2-3 weeks during the active phlebotomine sand fly period to protect dogs against the bites of P. perniciosus.     

Prevalence of intestinal parasites in dogs from public shelters in Serbia

Data on endoparasitic infections in dogs from dog shelters in Southeastern Europe are limited; thus, this study aimed to add to the existing knowledge on this topic by reporting on the prevalence of intestinal parasites in dogs from public dog shelters in the Republic of Serbia. In 2017 and 2018, individual and pooled fecal samples, were collected from 1267 dogs from six shelters. All samples were qualitatively examined for parasites using flotation tests. Seven taxa of intestinal parasites were identified: Cystoisospora spp., ascarids: Toxocara canis and Toxascaris leonina, hookworms, Trichuris vulpis, taeniids and Dipylidium caninum. The overall prevalence of intestinal parasites was 58. 3 % (78. 1 % in young dogs and 53.1 % in adult dogs). The parasites detected in both young (<1 year old) and adult dogs (>1 year old) were Cystoisospora spp. (20 % and 4.9 %), T. canis (33.5 % and 14.7 %), T. leonina (7.7 % and 2.3 %), and hookworms (16.9 % and 15 %), respectively. However, T. vulpis (9.6 %), taeniids (1.3 %), and D. caninum (5.4 %) were detected only in adult dogs. In the Belgrade shelter, young dogs had a higher prevalence of endoparasitic infections (18.9 %, 49/260) than adult dogs (14.8 %, 149/1007). In the Subotica, Jagodina and Niš shelters, young dogs had significantly higher (p < 0.001 and p < 0.05, respectively) prevalence of endoparasitic infections (10 %, 12.3 % and 14.6 %) than adult dogs (5.3 %, 8 % and 7.2 %). These results will be useful for establishing health care programs in dog shelters and implementing effective strategies for the control of intestinal parasites.     

Comparison of thyroid analytes in dogs aggressive to familiar people and in non-aggressive dogs

A cross-sectional study was performed in order to examine the association between canine aggression to familiar people and serum concentrations of total thyroxine (TT4), free thyroxine (fT4), thyroxine autoantibodies (T4AA), total triiodothyronine (TT3), free triiodothyronine (fT3), triiodothyronine autoantibodies (T3AA), thyroid stimulating hormone (TSH), and thyroglobulin autoantibodies (TgAA). The subjects were 31 dogs historically aggressive to familiar people and 31 dogs with no history of aggression. Behavioral evaluation and physical examination were completed for each dog in addition to a complete blood count, serum chemistry panel, TT4, fT4 by equilibrium dialysis, TT3, fT3, TgAA, T3AA, and T4AA. Significant differences were found between the two groups with respect to only T4AA, which was increased in the aggressive group, but the concentrations for both groups were within the normal reference range. There were no differences between the two groups in the thyroid analytes most commonly measured by veterinary practitioners evaluating thyroid function in dogs. The results of this study revealed no significant difference between aggressive and non-aggressive dogs in the thyroid concentrations most commonly used to diagnose canine hypothyroidism.     

Assessment of serotonin in serum,plasma, and platelets of aggressive dogs

Canine aggression is the most common reason for the referral of dogs to behavior practices. In addition, dog bites represent an important problem for public health and animal welfare. The serotonergic system is believed to play an important role in modulating aggression. The aim of the present study was (1) to assess the suitability of different types of blood samples for measuring circulating serotonin in canine clinical studies, and (2) to investigate the relationship between the serotonergic system and canine aggression. The assessment of serotonin was simultaneously carried out in serum, plasma, and platelets of 28 aggressive and 10 nonaggressive dogs with an enzyme immunoassay technique. The mean serotonin concentration in aggressive dogs was significantly lower than in nonaggressive dogs in all the assayed samples. These findings suggest an inverse relationship between the activity of the serotonergic system and canine aggression. Considering the simplicity of the methodology, the authors propose sampling serum as the most suitable method for measuring circulating serotonin in dogs.     

Efficacy of a continuous, multiagent chemotherapeutic protocol versus a short-term single-agent protocol in dogs with lymphoma

OBJECTIVE: To compare response rates and remission and survival times in dogs with lymphoma treated with a continuous, multiagent, doxorubicin-based chemotherapeutic protocol or with a short-term single-agent protocol incorporating doxorubicin. DESIGN: Nonrandomized controlled clinical trial. ANIMALS: 114 dogs with lymphoma. PROCEDURES: Dogs were treated with a chemotherapeutic protocol consisting of L-asparaginase, vincristine, cyclophosphamide, doxorubicin, methotrexate, and prednisolone (n=87) or doxorubicin alone (27). RESULTS: 63 of 86 (73%) dogs treated with the multiagent protocol (data on response was unavailable for 1 dog) and 14 of 27 (52%) dogs treated with the single-agent protocol had a complete remission. Dogs with lymphoma classified as substage相似文献   

Behavioral problems in old dogs: 26 cases (1984-1987)

Among 26 dogs greater than or equal to 10 years old, the most frequent owner complaints relating to behavioral problems were destructive behavior in the house (n = 10), inappropriate urination or defecation in the house (n = 10), and excessive vocalization (n = 7). The most frequent behavioral diagnoses were separation anxiety (n = 13) and breakdown of housetraining (n = 6). Most of the behavioral problems in the 26 dogs began after the dogs reached the age of 10 years, and most of the dogs had been owned for many years without having behavioral problems. Few behavioral problems in old dogs had a medical basis. Most cases of inappropriate urination or defecation in the house were not related to urinary or fecal incontinence, but were exacerbated by problems such as degenerative joint disease and renal disease. Behavioral therapy is appropriate for behavioral problems in old dogs, and, taking into account an old dog's health and physical limitations, techniques used are the same as for younger dogs.     

Evaluation of young and adult dogs' reactivity

Many authors have tested puppies' behavior early to detect adult behavioral disorders. Our pilot study aims to investigate puppies' reactivity toward tolerance of new situations and the consistency of behavior between puppy and adult dog. Seven tests (tunnel, direct looking, sudden noise, retrieving buster-ball, problem solving, bowl removal, and approaching) were used to evaluate the reactivity of 32 German shepherd dogs at 5, 7, and 9 months of age. Among these dogs, 17 were chosen by physical and behavioral traits to continue the training program up to adulthood (choice group) and administered the same tests at the age of 2 years. Through the observation of behaviors, the tests aim to assess sociality, exploratory and retrieving tendency, learning ability, playing aptitude, and tendency toward offensive aggression. The behaviors were ranked by degree of reactivity, and ranks were used as scores. The effects of gender and group on the 5- to 9-month reactivity profiles of all the puppies were estimated with a repeated-measures model. In the choice group, the behavior changes from 9 to 24 months and their dependence on gender were estimated with an analogous model. All puppies became more self-confident between 5 and 9 months. At 9 months, behavior was slightly better in males and in the choice group. Between 9 and 24 months, self-confidence, attentiveness, and ability to solve problems and retrieve objects improved, whereas playfulness decrease. Behaviors at 9 and 24 months showed very low variability, which indicated their very high similarity.