I was very leary of getting a dog because I have 2 cats who rule the household. I got a little puppy and named him Fenway. One cat, Cosmo, wasn't too sure of Fenway. Cosmo would hiss everytime Fenway got within a yard of him. My other cat, Maxie, became the alpha animal of the house and made sure Fenway did what Maxie wanted (like stay away from his food AND stay away from me)! I live in a 3 room apartment so you can only imagine how tough it was at first. Now, here it is 1 year later and we are all living in harmony. Cosmo no longer hisses at Fenway (even when Fenway goes to smell his butt). Cosmo tolerates him (though they are and never will be the best of friends). Maxie and Fenway have become buddies. They sleep on the same loveseat. They both sleep with me (one on one side, the other on the other side). Maxie still rules the roost and Fenway does what he says. It takes awhile and you have to be very patient but eventually they'll be able to live together. They may never be the best of buddies. But you'll just never know until you try. It just takes time. Good luck!