It's much harder to get older cats adjusted to one another. An adult cat often sees a kitten as someone he can discipline and be dominant over, so fewer problems occur. Before bringing a kitten home, it's important to familiarize your older cats with the kitten's scent. Go to the home or shelter where the kitten is located and rub a blanket or stuffed animal on the kitten to capture his scent. Leave this blanket or stuffed toy in an area that your cat frequents.