Over 85 percent of mammary tumors in cats are malignant and they tend to grow and metastasize quickly. Like breast tumors in humans, they start as a small lump in a mammary gland. Often, more than one mammary gland is affected. This disease is preventable by having female cats spayed before six months of age. 
 
Symptoms and Types
 
Mammary gland tumors begin as masses underneath the skin. However, over time they can become aggressive and ulcerate the skin. Cats tend to lick and groom the area excessively, and a strong odor can result as the tumor becomes necrotic an ...read more