Having the kitten be significantly different in age and also a combination of male vs. female (rather than both cats female or both male) can help. Also, try confining the kitten in one specific room so that it has it's own territory (try to avoid your adult cats favorite spot, so not to disturb it's routines. ) Give the kitten a scratch post, litter box, and maybe a comfortable blanket or old sweatshirt in a catbed .. .
To provide comfort. Slowly introduce them by having a barrier the kitten and cat can't get through to each other, but allow each other to get used to each other's smells. Slow introduction is best.
For many more tips try these links .. . perfectpaws.com/intro.html (scroll down to "Cats" section) hsus.org/pets/pet_care/our_pets_for_life... peteducation.com/article.cfm?c=1+2137&ai....
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