While I was at the landfill unloading construction debris, I saw a red SPCA pickup truck tossing dog bodies on the ground, about 8 of them. Then a landfill bulldozer just pushed the bodies into the rest of the trash and smashed them with a giant roller. I was appalled.
Community standards dictate that animals put to sleep at the pound be cremated. If you are talking about a vet and your dog dies or you have to have him put down for some reason, they will give you the body for burial if you want, or else they will cremate the body.