Getting him neutered might help with the marking also. A trip to the vet probably wouldn't be a bad idea. That way you could get an idea of what you're dealing with. Some males still look like they have "items" back there after being neutered. A small incision is made and then the testicles are squeezed out and the outside container is still left. What a description! I'm trying to be polite, and it just came out crazy. I hope you understand what I'm saying. He may be neutered but still look like a male. A vet could tell you for sure.