Q. If my dog has its leg amputated because of cancer how long is he likely to survive?
A. That depends on whether the cancer was localized, and the vet got it all, or whether it metastasized to other places in the body. If is was a tumor that had not spread, his lifespan should be what it was before the cancer was found. If it had, the time he has left would depend on what type and how aggressive the cancer is and where in the body it is.
A. It all depends on the type of cancer. This is definitely a conversation that you should have with your vet, as they know you and your dog much better than strangers on the Internet.