The first report of the ante-mortem diagnosis of Ollulanus tricuspis infection in two dogs

Ollulanus tricuspis is a small nematode parasite of thestomach, and its infection has been reported worldwide in cats but only one report in dogsas post-mortem diagnosis. Two dogs, kept in the Tokyo area, were presented for chronicvomiting. Chronic gastritis was diagnosed histologically, and many nematodes were detectedin endoscopically-biopsied gastric samples and in the mucus of vomitus in both dogs. Theparasites were small (<1 mm), and their morphological characteristics were consistentwith those previously reported for O. tricuspis. The symptoms in one dogcompletely disappeared after anthelmintic therapy. To our knowledge, this is the firstreport describing ante-mortem diagnosis of spontaneous gastric O.tricuspis infection in dogs in which infectivity and pathogenicity of thenematode are suggested.