A 12 year old, intact male, German shepherd dog presented to Cornell University Hospital for Animals emergency service on Thursday 9/25/2008 for the treatment of urinary obstruction. The dog had a six day history of progressive urinary signs ultimately resulting in anuria. A large firm urinary bladder, that was difficult to express manually, and a firm mass in the region of the bulbourethral gland were the most significant physical examination findings. A penile amputation, castration, scrotal ablation and scrotal urethrostomy were performed. Histopathologic evaluation and factor VIII antigen IHC staining confirmed hemangiosarcoma as the diagnosis. Doxorubicin and dacarbazine chemotherapeutic agents were administered. The patient was euthanized 129 days following diagnosis and had evidence of gross metastasis at the time of euthanasia.