A friend of mine that lives out in the country came upon his golden retriever with a headlock on a possum. They have been a real problem where he lives, hanging out on his deck trying to get in the house, eating the cat food and living under the porch. He had a 9mm Springfield XDM, shot the possum once in the head and once in the neck. As he was hauling the possum off to bury it, it started breathing again and he had to shoot it 2 more times. I've only hunted birds and rabbits and don't have much experience with possums and raccoons but for those of you that do, where do you shoot a possum to finish him off in one shot? Thanks for any help.