Multiple cutaneous mast cell tumors in a dog: a case report and brief review.

A spayed female yellow Labrador Retriever was presented to the small animal clinic at the Western College of Veterinary Medicine with an ulcerated, draining mass on the caudal aspect of the right thigh. Multiple small, hairless masses were also present on the thorax and in the flank folds. Fine-needle aspiration and cytological examination revealed well-differentiated mast cells and numerous eosinophils. A diagnosis of multiple cutaneous mast cell tumors was made. The clinical and cytological findings of this case are discussed, as well as the treatment and prognosis for mast cell tumors in general.