Newbie to site. We have taken in a stray male had him neutered and shots we have set up his own room with litter and food and water we have 3 indoor existing cats and a dog the new cat is not doing so well integrating in none of my indoors seem to accept him have esp one young alpha male who attacks him and us if we get in the middle of the fight very stressful for all but the new cat is very loving with us and wants to stay inside winter coming on help . How do I get the 2 males to be friends