I've had my two cats for a little over a year (a female and male both approximately 2 years old). When I brought Sylvester home (a month after I adopted Kona), she would have nothing to do with him or myself for that matter. She hissed at everyone. After a few months, she tolerated Sylvester, but would not initiate playtime. Just recently, I've noticed they are playing and chasing each other. It's a welcome site and well worth the wait. When I left for work this morning, they were side by side looking out the window.

You may want to put a small dab of perfume on them so they smell the same.

Be very patient. Even if they don't become best friends, they will learn to tolerate each other and exist in the same house.

Good Luck!!!