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two brindle french bulldogs looking up at camera and standing in grass

Mast Cell Tumors – A Common Skin Cancer in Dogs

Updated May 7, 2026 – It’s normal for our dogs to get a little lumpy and bumpy as they age. Although the majority of these lumps are benign, owners still need to be concerned about the possibility of skin cancer, particularly the most common malignant skin cancer of dogs – mast cell tumors.