Brother I had a dog that had to have a leg removed because of bone cancer. He did well but the cancer came back. And with in a year and a half after the leg surgery I had to let him go. This subject brings a tear to my eye as I type.
You have all my hopes and all my prayers. God bless you and your dog. PM me if you want to talk and I will give you my # I have had to deal with 3 dogs that had cancer
Good luck