Originally Posted by westofyou
Be slow in the introduction, 3 is a new dynamic, sometimes one of them gets peeved.
Or sometimes two of them get peeved.
We've had two cats for a few years- Boomer and Yokozuki. Boomer's handicapped (birth defects involving his front legs and paws) and Yoko arrived after we agreed to "babysit" her for a neighbor while his wife was pregnant. They got along fine after a little bit.
Then we acquired Stitch last Christmas after a neighbor found her half frozen outside our house. The introductions did not go well. Yoko is very protective of Boomer. Boomer wants nothing to do with Stitch but Stitch wants everything to do with Boomer.
The daily result? Stitch tries to play with Boomer. Boomer hisses. Yoko walks up and pops Stitch on the head. Stitch walks away to play with something that won't hiss or pop her on the head.