The marking and humping may stop after hes neutered. My male is neutered and he only marks outside and he barely ever humps. If the marking doesnt stop though you'll have to get him some bellybands so he doesnt ruin your furniture. As far as their getting along I would let them work it out unless they are fighting and you hear a yelp. They are just establishing a pecking order. Mine are 4 and they still growl at each other at times but they have never fought |