The transition from kitty to adult cat is a quick one. Your cute cat may forever seem like your little baby, no matter what her technical age is. However, when it comes to the eternal question of when exactly a kitten becomes an adult cat, some say around 6 months while others give it approximately a year or longer. Growth. An adult cat often sees a kitten as someone he can discipline and be dominant over, so fewer problems occur. Preparing Your Adult Cat for a New Addition Before bringing a kitten home, it's important to familiarize your older cats with the kitten's scent.
When you bring your kitten home, allow your cat to sniff them while the kitten is in their carrier or your arms. Go directly to the room previously designated and set up for your new kitten and allow the kitten to explore. Their litter box, food bowls, bed and some toys should all be easily accessible. Introduce the adult cat to the kitten's scent. Hold the kitten gently but firmly in your hands near the adult cat. Let the cat smell the kitten so she can begin to get acquainted. If the adult cat reacts well to the kitten, she may lick or nuzzle him. If the adult cat feels hostile toward the new kitten, she may hiss or try to swipe at him.