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Is the Lump on My Dog Cancer?

Cancer cells next to a dog, representing dogs with cancer in Jupiter
A bump you notice while fastening your dog’s harness can leave you with questions long after the walk is over. Is it new? Has it grown? Could it be cancer? Concerns about cancer in dogs are understandable, but a lump alone cannot tell you what is happening beneath the skin. When you notice a new growth on your dog, arranging an examination at Jupiter Veterinary Hospital & Urgent Care is a way to move from uncertainty toward answers.

Not Every Growth Is Cancerous

Approximately 1 in 4 dogs will develop a form of cancer. The risk of cancer in dogs increases with age, and certain breeds are predisposed to specific cancers, but neither factor determines an individual dog’s diagnosis. Still, dogs develop lumps for several reasons, including cysts, fatty growths, inflammation, and infections. Some masses are cancerous, while benign growths do not invade surrounding tissues or spread to distant parts of the body. Even a benign lump should be checked because it may cause irritation or interfere with movement.

Watch for Changes Beyond a Lump

A new bump, a rapidly changing growth, or a sore that does not heal deserves an appointment with a veterinarian. Other possible signs of cancer in dogs include unexplained weight loss, stiff movement, unusual bleeding from the nose or mouth, breathing problems, reduced appetite, and lower energy. These symptoms occur with other illnesses, too, so they are reasons to investigate rather than proof of cancer. Tell your veterinarian about changes in your dog’s habits, including symptoms that appeared before you found the lump.
A lump on a dog's hind leg highlighted with red pain marks

What a Veterinarian May Recommend For Checking a Bump

Contact Jupiter Veterinary Hospital & Urgent Care when you find a mass, and describe its location, approximate size, and any recent changes. During an exam, a veterinarian will assess the area, review your dog’s health history, and ask about other symptoms. 

Depending on the findings, the vet may recommend taking a tissue sample for examination (biopsy). The results can guide recommendations about monitoring, additional testing, removal, or referral. Avoid trying to squeeze, drain, or treat the growth yourself.

Make Checking Your Dog a Comfortable Routine

A calm brushing session or petting gives you an opportunity to look and feel for changes beneath your dog’s coat. Gently check all over your dog, paying attention to unfamiliar bumps or changes around older ones. Be sure to lift the lips to look for sores, unusual growths, or bleeding inside your pet’s mouth, too.

Do not continue handling an area that causes discomfort, as your dog could react negatively. If you find something, report new changes to your veterinarian.

A person’s hands checking a dog's skin for lumps at Jupiter Veterinary Hospital & Urgent Care

Some Cancers Have No Visible Lump

Not all cancer in dogs produces a growth that you can see or feel during a skin check. Cancers affecting internal organs or blood cells may instead cause persistent changes in appetite, weight, energy, or behavior. A dog with no obvious bumps could still have cancer. Let your veterinarian know when something about your pet’s body or daily routine becomes different or worsens.

Get Answers About Your Dog’s Lump in Jupiter, FL

Jupiter Veterinary Hospital & Urgent Care provides veterinary care for dog owners from Jupiter, West Palm Beach, Jensen Beach, and nearby communities. To arrange an evaluation of a new lump, contact our team. Finding a growth does not mean you need to assume the worst. If cancer is diagnosed, our team will talk you through options for your pet. We are here to support all pet owners in our local community.

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Michele, CVT, CVBL

Practice Manager

Michele is a certified veterinary technician and certified veterinary business leader. She spent most of her veterinary career as a surgical technician focusing on anesthesia and peer education. She was born and raised in Florida and loves spending her free time with her family or working outside in the yard. Michele shares her home with 3 French bulldogs, a Pug, a Staffordshire Terrier, 3 cats, 2 potbelly pigs and multiple chickens.