Sergeant is a 4 year old male castrated Bichon Frise dog that presented to the Bobst Hospital at the Animal Medical Center on July 31, 2007. He presented as a referral from his regular veterinarian for abnormal coagulation parameters and a hematoma on the left shoulder. The referring veterinarian had also aspirated the hematoma on the left shoulder and noted red blood cells on cytology. Sergeant had been a generally healthy dog with no chronic medical conditions. He was castrated as a young dog, and his owners did not report any bruising, bleeding or other complications after his castration. He is an indoor dog though he had been outside in a yard in New Jersey with another dog within the month of July; this other dog was healthy. The hematoma had first been noted by a groomer on July 28, 2007. His appetite, elimination habits and attitude were normal according to the owner. There was no history of trauma or toxin exposure. He has never received a transfusion and has not been on any medications.