Hello,my cat is 5 years old we recently adopted a cat that we found in the street,and my cat hates the newly found kitten the cat that´s angry doesn´t eat or behave well,how many days do we need in order for the angry cat to start treating my new kitten well?. please give me some advice on the days that we have to wait in order for them to become friends(cat and new kitten)

I don't think there is any guarantee that they will become friends with time. Cats can be pretty territorial.

Having said that - in my experience, young kittens tend to be too energetic for an older cat and can just plain annoy it, so if yours is a bit hyperactive, perhaps you want to limit the time it is on the loose around the older cat for now.

There's no set time-frame, of course, but I've rarely seen this sort of problem go on for very long--more than a couple of weeks. As a rule, the older cat trains the kitten, and that is a very good thing. You want that.

Is your 5yr old male or female? Has it been spayed or neutered?

How about the kitten? How long have you had it? Is it male or female? Has it been spayed or neutered yet?

You do need to be patient while they work out their dynamic. But supervise them to be sure that the older cat doesn't go overboard.

If you can get back to me with answers to the questions I've asked I may be able to give you a better sense of what you're dealing with and some things that can be done to help them make the transition more quickly.

I used to have two cats that were sisters and they were best friends, but sometimes one of the cats would leave for long periods and come back later and the other cat would get so jelous of her when she came back. It was so funny because she would ignore me and if I tried to pet her she would walk away. She was usually a really friendly cat. If the two cats were together for long time the cat wouldn't get jealous of the other one. Maybe if you keep your cats together for a long time they won't be jealous. One thing that would calm my cat down was if brought out a toy for both of them to play with like a ball or a toy with a string that they could take turns hitting. It might work for you too.

My 5 year female cat has been spayed for a long time since it was 1 years old,the kitten we had it for 2 days until now,it's a female too,and also the kitten has not been spayed yet.also the kitten is about 2 months old.thank you for your help,thanks a lot.

my 5 year female cat has been spayed for a long time since it was 1 years old,the kitten we had it for 2 days until now,its a female too,and also the kitten has not been spayed yet.also the kitten is about 2 months old.thank you for your help,thanks a lot.

Thanks so much for the additional info. I really wouldn't worry about anything if I were you. It's going to take them a little time to get to know each other and work out their own dynamic. Adult females are often a bit more resistant to newcomers than are adult males, but I'd be surprised if they aren't well on their way within a couple of weeks. My advice is to let them spend lots of time around each other, getting to know and explore one another. But do supervise them to make sure that the older female isn't too harsh with the little one. Remember that it's okay if the adult disciplines the kitten, and this can sometimes look pretty harsh to our eyes (pinning her down, giving her little pites on the back of her neck, putting her mouth over her throat). These are the things the kitten understands, because this is how mothers discipline their babies. You just want to be vigilant and keep an eye on things until they settle into a routine and until you can be confidant that the adult won't go overboard and end up hurting the kitten. If this happens then you'll need to intervene and set some boundaries for the older one. If she is too rough, simply clap your hands to break them up and remove the adult to a small room for fifteen minutes of "time out". I've rarely had any problems with this, since adults tend to be far more patient with kittens (as human adults are with infants).

You will want to get the kitten spayed as soon as she's old enough, though, otherwise you will have serious problems down the road. If she isn't spayed, and the older one is, there could be real aggression later on, so once she's about six months old, get her fixed. If you do that I doubt you'll have any real problems. Just remember that this is a huge change for both of them and it's going to take them a little time to get their bearings. Try to be patient, but also vigilant and, if there is any aggression, firm with the one who initiates it.

Good luck to you and your kids.