Well im not sure if this differs too much, but we just got a new kitten and had to introduce him into a house filled with other animals and what we did was keep him in a seperate room for a couple days with all the stuff he needed and my family perioically went up to play/visit with him. With a dog you could do the same thing but you'd have to let him outside to "go" every so often. Then after a day or two we started bring our kitten down for little visits with the other animals and then brought him back up to his room just so he could slowly get used to all the other animals. And if after a while and they still don't get along, keep them on different floors of the house if thats possible.