Q: I recently adopted Missy, my mother’s middle-aged, mixed-breed dog. She was never spayed, and she has two small masses in her mammary glands. Are these masses likely to be cancer? If not, should I ...

Tumors develop when cells in the body grow uncontrollably. Finding a tumor on your dog can be very frightening, but they are not always detrimental — some are benign, while others are malignant.

Just like humans, as dogs age, it’s not uncommon for lumps, bumps and masses to appear on their body. While many of these lumps and bumps are harmless growths and considered benign, others could be ...