Mast Cell Tumor Most Common Canine Skin Cancer

A mast cell tumor, or MCT, is the most common form of skin cancer in dogs.

Dogs that develop a mast cell tumor are at increased risk of forming more in the future, so monitor your pet's skin regularly and report any new lumps or bumps to your veterinarian immediately. sarocha wangdee/Shutterstock

Q: My Lab mix has a mast cell tumor. What can you tell me about this condition?

A: A mast cell tumor, or MCT, is the most common form of skin cancer in dogs. Mast cells are white blood cells designed to fight parasites and allergies. It’s not clear why some of these immune cells develop into tumors.