Updated October 14, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Cancer treatment for dogs usually involves one or more of surgery, chemotherapy, radiation therapy, and newer options like targeted drugs and immunotherapy. The goal in veterinary oncology is good quality of life: most dogs tolerate chemotherapy much better than people do, with few having serious side effects. When cure isn’t possible, palliative care focuses on comfort. A veterinary oncologist can help you weigh options for your dog’s cancer type and stage.
Main treatments
- Surgery: removes localized tumors and can be curative for many skin and some internal tumors.
- Chemotherapy: used for widespread cancers like lymphoma, or after surgery to slow spread. Doses are designed to minimize side effects. Most dogs don’t lose their hair.
- Radiation therapy: for tumors that can’t be fully removed, such as nasal or brain tumors, or after incomplete surgery. Palliative radiation can relieve bone cancer pain.
- Targeted therapy: such as toceranib for some mast cell tumors.
- Immunotherapy: such as a vaccine used for oral melanoma, and other immune-based treatments.
- Tumor-specific injections: such as tigilanol tiglate for some mast cell tumors.
- Palliative care: pain relief, anti-nausea medication, appetite support, and steroids for some cancers.
Staging first
Before treatment, vets usually check how far the cancer has spread with bloodwork, imaging, and lymph node sampling. See cancer stages explained.
Questions to ask your vet
- What’s the goal: cure, control, or comfort?
- What’s the expected outcome with and without treatment?
- What side effects are likely, and how are they managed?
- How many visits are involved, and what’s the cost?
What to avoid
- Unproven “cures” and salves, some of which cause severe burns.
- Starting supplements during treatment without asking your oncologist. Some interfere with chemotherapy.
- Human pain medications.
Sources
- Merck Veterinary Manual: Principles of cancer treatment in animals
- Biller B, et al. 2016 AAHA Oncology Guidelines for Dogs and Cats. J Am Anim Hosp Assoc. 2016
- Veterinary Cancer Society: Warning signs of cancer in pets
- Veterinary Cancer Society: Find a veterinary oncologist
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.