Aplasia of the epididymis and vas deferens in the dog

The occurrence of aplasia of the epididymis and vas deferens in a Golden Retriever is reported. The dog was presented for a fertility examination. Scrotal palpation indicated aplasia of the left epididymis and vas deferens. These findings were confirmed by surgical examination and a testicular biopsy taken at this time revealed active spermatogenesis to be present. The upper urinary tract was examined and found to be normal. The condition was not evident on scrotal examination of six siblings.