Can Dogs Get Cancer?
Many canine cancers respond well to treatment when caught in time. Watch for the warning signs.
Yes, dogs can get cancer, and it is one of the leading health concerns in older dogs. The word is frightening, but many canine cancers are treatable, and some are curable when found early. Like diabetes and other conditions of older dogs, it is easier to manage when caught soon. Knowing the warning signs and keeping up regular vet checks give your dog the best possible chance.
Warning Signs to Watch For
Some tumors can also trigger stomach ulcers, which may show up as vomiting or dark, tarry stools.
| Sign | What to look for |
|---|---|
| Lumps and bumps | New growths, or ones that change size or shape |
| Sores that do not heal | Wounds that linger for weeks |
| Weight loss | Dropping weight without a diet change |
| Appetite or energy loss | Eating less and lasting tiredness |
| Bleeding or discharge | From the mouth, nose or other openings |
| Lameness or trouble breathing | Persistent limping or labored breaths |
What to Do
- See your vet promptly. Do not wait on a new lump or a sign that lingers.
- Get it checked. Tests such as a biopsy, blood work or imaging pinpoint the problem.
- Discuss the options. Ask about surgery, chemotherapy, radiation and quality of life.
- Support your dog. Follow the treatment plan and keep your dog comfortable and loved.
Frequently Asked Questions
How common is cancer in dogs?
Cancer is one of the leading causes of death in older dogs, and roughly one in four dogs develops it at some point. Certain breeds and older dogs are at higher risk. The encouraging news is that many cases are treatable, and some are curable when found early.
What are the early warning signs of cancer in dogs?
Watch for new or growing lumps, sores that do not heal, unexplained weight loss, loss of appetite, unusual bleeding, persistent lameness, difficulty eating or breathing, and a lasting drop in energy. Any of these lasting more than a week or two warrants a vet visit.
Is dog cancer treatable?
Often, yes. Depending on the type and stage, treatment may include surgery, chemotherapy, radiation or newer targeted therapies, sometimes to cure and sometimes to give good quality time. Early diagnosis greatly improves the options and the outcome, so do not delay a check.
Can I do anything to lower my dog's cancer risk?
You cannot prevent all cancers, but you can help. Keep your dog a healthy weight, avoid tobacco smoke, discuss the timing of spaying or neutering with your vet, and keep up regular checkups so problems are caught early. Prompt attention to new lumps or changes matters most.
⚠️ Emergency? If your dog may have swallowed something toxic or is seriously unwell, contact your vet or a pet poison helpline immediately (in the US, the Pet Poison Helpline is 855-764-7661).
Sources: American Kennel Club (akc.org), VCA Animal Hospitals (vcahospitals.com) and the American Veterinary Medical Association (avma.org). This guide is for general information and is not a substitute for advice from your own veterinarian. See our editorial & review policy.
