What it is
Bone is living tissue that is constantly broken down and rebuilt. In osteosarcoma, bone-forming cells grow out of control, eating away healthy bone and laying down weak, disorganised bone in its place. The swelling stretches the tough membrane around the bone, which is why the pain can be so intense, and the bone underneath becomes fragile.
It is linked to body size: large and giant dogs are more at risk. It tends to appear in middle-aged or older dogs, though younger dogs are not spared. The front legs near the wrist and the hind legs near the knee are the places it tends to arise.
Life with a dog in pain changes quickly. Until a vet has looked at a limp, keep your dog from jumping, rough play and slippery floors, because a weakened bone can break.
Signs you may notice
- A limp that gets worse
- Firm swelling on a leg
- Won't put weight on a leg
- Cries when the leg is touched
- Less keen on walks
You may notice a limp that doesn't go away or keeps getting worse, and a firm, painful swelling on a leg. The dog may avoid putting weight on the leg and become more listless.
When to see a vet
A limp that lasts more than a few days, or any firm swelling on a leg, is worth booking a visit for. If your dog suddenly cannot use a leg at all, it needs a vet immediately.
This is general information, not veterinary advice. For your own dog's health, tests and treatment, see a vet.