1) новая кошка в отдельной комнате
2) новая кошка в квартире, старая заперта
3) старая кошка в комнате новой кошки, но без новой
4) начинают пересекаться
5) феливей
You can't just bring in a new cat, especially an adult, let it out of the carrier, and think everything is going to be just great with the resident cat. It's not.
читать дальшеYour resident cat is going to see the new cat as an intruder into his territory, and will instinctively want the new cat to leave ASAP.
This is why there is a specific method for integrating new cats into an established cat's territory. It starts with putting the new cat in a room, by itself, with food, water and a litter box. Visit the new cat during the day so it doesn't feel isolated, and can start to form a relationship with you.
Meanwhile, your new cat and your resident cat will be meeting and greeting under the door.
New cat will live in the room for about a week, then you can start Phase 2. Shut the door wherever resident cat is, and let new cat out into the rest of the house for a limited amount of time, 15 or 30 minutes, a few times a day. Then put new cat back in his room, and let resident cat out. Do this for another week.
Phase 3 consists of putting new cat in another room, and letting resident cat investigate the new cat's room. Again, 15 or 30 min at a time, a few times a day. This goes on for another week.
Phase 4 consists of letting new cat out while resident cat is free, too. SUPERVISE THE INTERACTIONS. If resident cat is too aggressive, separate them for the rest of the day. You'll be doing these "both of y'all together" interactions for 15 or 30 min at a time, several times a day. Try to NEVER let the interaction get too aggressive on either cat's part. If one starts being too aggressive, put that one in the time out room.
For example, if your resident cat starts growling and getting ready to attack new cat, pick up resident cat and put him in the room new cat has been living in. Or if new cat starts stalking resident cat, who isn't doing anything, put new cat in his room. They'll learn aggressive behavior gets them put in the closed room, which is no fun for anyone.
I also recommend getting Feliway plugins.