Just to give you some info, when I was a kid our dog was hit when he was about 6 years old. He was banged up, but the worst damage was his left front leg. Not broken, but the nerves were shot. The vet said to keep it tied up and the nerves might regenerate. The dog would have none of that, kept getting his leg loose, and dragging it, so it was getting infected. My dad told the vet to take the leg off rather than putting the dog down. That old dog lived another 7 or 8 years and got around fine on 3 legs. He was a great watch dog and having just 3 legs didn't hinder him a bit.
