Unusual cases of penile vascular tumors in dogs: report of two cases.

Vascular tumors affecting the reproductive tract in male dogs, including hemangiomas and hemangiosarcomas, are rarely reported in veterinary medicine. However, they are more frequently observed in other anatomical sites in dogs such as the skin, spleen, and the liver. Despite their low incidence in the genital region, these neoplasms should be considered when compatible clinical signs are observed. This case report describes the clinical and pathological findings of two penile vascular neoplasms in dogs, highlighting their differing prognoses. The first case was classified as hemangiosarcoma and the second case as hemangioma. The first patient was referred for hematuria and stranguria; while the second dog showed haematic preputial bleeding. In both cases, protruding masses of the penile mucosa were identified and surgically removed with an excisional surgery. Histopathological analysis confirmed their vascular origin, allowing definitive diagnosis. Given that clinical signs can be nonspecific and overlap with other urogenital disorders, histopathology plays a crucial role in guiding surgical management, establishing prognosis, and differentiating between benign and malignant vascular tumors.