I had 3 dogs dogs, ranging in age from 2 years to 12 years and I brought 2 kittens into the house. I kept them apart for about 6 weeks, letting them sniff at each other through a crate, and when I finally introduced them all together, they got along like a great big happy family. I added a third kitten and she fit in just as well. The oldest dog kept everyone in check till he died last November. As I grieved so did the other animamls as they lost a family member as well. They get along great now, sharing the same water bowl, sleeping together, and sometimes chasing each other. So take your time and they will be best friends, eating, sleeping and playiing with each other!