Osteosarcoma (bone cancer) in dogs
- Osteosarcoma is a type of bone cancer.
- Osteosarcomas are painful tumours that often first appear as hot, solid, tender swellings. They are most common in leg bones, but can affect any bone in the body.
- Osteosarcomas are aggressive tumours that spread to other parts of the body (often the lungs).
- Sadly, the outlook for a dog with an osteosarcoma is very poor.
- Giant breed dogs are most at risk of developing an osteosarcoma.
What is an osteosarcoma?
Osteosarcomas are painful and aggressive bone cancers that spread quickly around the body. An osteosarcoma can develop in any bone, but they are most common in leg bones (see diagram below).
Osteosarcoma tumours destroy the bone around them, sometimes causing them to break (we call this a ‘pathological fracture’).
Treatment and outlook
Sadly, if your dog has an osteosarcoma, their outlook is very poor. Even with specialist surgery to remove an osteosarcoma, and chemotherapy to control spread, most dogs survive less than a year after diagnosis. This is because osteosarcomas are very painful and over 90% of dogs diagnosed have tumours elsewhere in their body (most so small they can’t be seen on scans). It’s important to consider this when deciding on a treatment plan. Treatment should be focused around pain relief and maintaining a good quality of life for your dog. Once your dog’s quality of life starts to drop and their tumour becomes painful, euthanasia is the kindest option. Every dog with an osteosarcoma is different and your dog’s treatment will be tailored to suit them as an individual. Your vet will discuss all your options and offer advice about when it is time to say goodbye.
Managing an osteosarcoma is often very expensive, especially if you opt for surgery and chemotherapy. It’s very important to speak openly to your vet about your finances, the cost of treatment, as well as what you think is right for your dog. There is often more than one treatment option, so if one doesn’t work for you and your pet, your vet may be able to offer another.
Consider insuring your dog as soon as you get them, before any signs of illness start. This will ensure you have all the support you need to care for them.
Published: November 2019
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Written by vets and vet nurses. This advice is for UK pets only.
Illustrations by Samantha Elmhurst