I had to give Mocha about 2 weeks to learn to love Bonzo. Mocha was about 1yr. when I brought Bonzo home, he was about 9wks.... so tiny.....I kept running next door to my neighbor (Now my Hubby ) crying thinking, "What have I DONE!" Mocha hissed at Bonzo and then hissed at me. As if to say, "HOW DARE YOU!" Then she swiped at me and went and hid for a few days under my bed. Finally I told her he was staying so get used to him! It took 2weeks or so but they finally worked it out and no one got hurt. (Thank God!) They are now the best of friends.