How yo introduce a new cat to a old cat?

[Alex Achaval]

Well I got a cat that we have for a a year now and hes a indoor cat cat and outdoor cat. We found this kitten in the street and I took him to my room and I hear hissing from outside but the kitten does nothing. How to introduce them properly?

 

[Mac Dre]

A handshake

 

[EllieF]

introduce them outside, it helps, put one on either side of you and pet them both. just always supervise until they are immune to one another.

 

[Aubrey Ashby]

I did this with my dog meeting my kitten.
This can work on cats.

First off don't let them near each other for a week, this allows them to say hey i smell new kitten and make the accustomed to the new smell of another animal.
after the week is over you make sure both have a collar and a leash put hook both of them onto their collars and bring em into the same room. let them walk over to each other and explore. if the hiss then hold the collar so they don't get hurt trying to claw at each other. IF they don't hiss then you are ok but let them explore each other for 20 min and if they go 20 min without fighting or hissing then you can take them off the leash.

 

[cat lover]

Assuming you got your resident cat when he was a kitten, he still is very much a kitten, so the age difference is not that great. Hissing and growling is common, as suddenly there is a challenge to his alpha status.

Keep the kitten in your room, at least until you get it checked by a vet. You don't want to introduce anything to your cat. What I am primarily thinking is if the kitten has worms, and they share a litter box, both would have to be treated.

Then, when vet checked, you can switch rooms, and they get used to each others scents. And then more and more time together.

It simply will take some time and patience for them to get used to each other. And if both kittens, realize that kittens play rough. Very rough. So it is easy to over think what may be happening.