Male pseudohermaphroditism is not commonly reported in veterinary medicine. Here, a 3-year-old Maltese/poodle mixed dog presented with malformed external genitalia and episodic hematuria. Inspection and palpation of the external genitals showed a malformed penis, shortened prepuce, external urethral orifice, and cryptorchidism. There was no urethral meatus at the tip of the penis. The urethral opening was situated between the prepuce and the penis. The anterior half of the prepuce was absent, and the penis was free and exposed to both trauma and licking. Plain radiographic examination showed absence of an os penis in the penis. A double-contrast cystograph showed the suspected uterus as well as the cystic calculi. A hypoechoic space was seen at the dorsal portion of the urinary bladder. The space was suspected to be the uterus. A sagital ultrasonograph showed cystic calculi in the urinary bladder. During surgery to remove cystic calculi, hypoplastic testes as well as the uterus were observed. Histological examination of the testes showed the seminiferous tubules and interstitial cells. The sertoli cells and spermatogonia were adjacent to the basement membrane. No evidence of spermatogenesis was found. Striated squamous epithelial cells and smooth muscle cells were found in the uterus. This dog had vestigial oviducts as well as a uterus with male-appearing external genitals.

A 13-year-old, male mixed breed dog was presented to Veterinary Medical Center, Chungbuk National University for diagnosis and treatment of enlarged mass in right inguinal region. On hematological test, monocytes and neutrophils were slight increased, but other hematological values were normal. On radiological finding, opacity and size of mass in right inguinal region were increased. The mass and testis were removed surgically. Removed mass was oval-shpae and bulky with 5.6×7.6×5.2 cm. Histopathological finding of the mass revealed large and round to polyhedral cells and it was diagnosed as malignant seminoma. That was diffuse type seminoma near to malignant tumor without metastasis. During the follow-up for 13 months, patient showed normal contition without recurrence.