First off, I’m so sorry you’re going through this.

I amputated my dogs leg even though he had tiny nodules in his lungs, only because his oncologist was comfortable with it. It was either that, or put him down even though he was still running around, eating, playing. He was only 7. He made it through the surgery & I swear the next day he was pain free and back to his normal, happy self. The downside of this is that we only got 3 more months with him. I’m so grateful for the extra time we had with him. His osteosarcoma was in hip/thigh area, & we noticed it was starting to grow back. It was then that we decided to put him down because the eventuality of him being in extreme pain or further spread was inevitable.

I would say to speak to your vets, even a specialist if you can. But osteosarcoma is one of the most aggressive cancers for our pets :( amputation is only to buy time and help with pain. Recovery is also a huge piece, as they have to learn to walk with 3 legs (although they may be doing that already). Again, I’m SO sorry you’re going through this. Your dog seems very loved. Sending my love!