Hemangiosarcoma in dogs
Hemangiosarcoma is a cancer of blood vessel cells, often in the spleen, heart or liver. It can grow quietly until it bleeds.
Last updated: October 2026 · 2 sources · see sources
Signs to watch for
- Sudden weakness or collapse
- Pale gums
- Swollen belly
- Fast breathing
- Sometimes no warning
Trouble breathing, collapse, repeated vomiting, not peeing, or a seizure that lasts more than a few minutes needs a vet right away. See when to see a vet.
How vets diagnose it
Ultrasound and X-rays find a mass or bleeding. Diagnosis is usually confirmed by examining the mass after surgery. [2]
How it's treated
Treatment often means emergency surgery to remove the spleen, followed by chemotherapy for some dogs. [2]
What it costs to diagnose and manage
| Item | Typical US price | Src |
|---|---|---|
| Diagnosis (exam and tests) | $500–$1,500, | [1] |
| Treatment | $5,000–$10,000 | [1] |
These are typical US ranges from the sources listed. Your pet's costs depend on how severe things are, the tests your vet recommends, your pet's size and where you live. Ask your vet for a written estimate.
Outlook
It's a serious cancer. Your vet will help you weigh options and comfort care. [2]
Common questions
What is hemangiosarcoma in dogs?
Hemangiosarcoma is a cancer of blood vessel cells, often in the spleen, heart or liver. It can grow quietly until it bleeds.
What are the signs of hemangiosarcoma?
Common signs include: sudden weakness or collapse, pale gums, swollen belly, fast breathing, sometimes no warning.
How do vets diagnose hemangiosarcoma?
Ultrasound and X-rays find a mass or bleeding. Diagnosis is usually confirmed by examining the mass after surgery.
How is hemangiosarcoma treated?
Treatment often means emergency surgery to remove the spleen, followed by chemotherapy for some dogs.
How much does hemangiosarcoma cost to treat?
Diagnosis (exam and tests): $500–$1,500,; Treatment: $5,000–$10,000. Costs vary with severity, tests, your pet's size and where you live.
Related
This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.