How long should i keep my cat and kitten seperated?

Untill you know the kitten will be OK with your cat just keep having supervised meeting every now and again.

As long as you've kept them in separate room for a couple, 3 days I think you can let the kitten lose. I don't know about that, though, if the adult cat is a male. Make sure you have two litter pans and maybe separate food and water stations to start with.

The hissing is a normal reaction to a new pet in the house, but it's unlikely that a female cat would harm a baby kitten. I've never had problems introducing a new kitten and the only time I had one caged or separated was when I brought one home that was only a few days old. That one was kept in a large cage at night until she was 8 weeks old.

I wouldn't keep them separated at all. I know some people say to, but it prolongs the situation and I don't think it helps.
I usually just keep a kitten in a carrier for an hour or two and then let him/her out.

You are going to have to let them work it out. Cats have a process they have to go through in this situation. It looks scary, but it is instinctive, nautural and right. I have never seen a cat hurt a new kitten. She'll hiss and she might bop her on the head and act hostile, but she is just teaching the kitten the "house rules". Like you would if you had someone move in. When she is satisfied that the niceties have been observed, she'll settle down.

There are a few things you can do to help. I know it is tempting to lavish affection on a new kitten. However, try to keep it even. For example, if they are together, never pet just one of them. Your older cat will feel insecure about her place in your affections. If you reassure her, she'll be happy sooner. Also, do the best you can not to separate them, even if the kitten appears to be bullied. The kitten expects her to behave like this and your cat will resent it if you stop her.

In the meantime, you can get some toys just for the kitten so that she can play without the cat getting too upset.

The most important thing I can say is just to be calm and let them do their thing, so to speak. They'll be pals before you know it!

Enjoy them and good luck.

when I adopt another kitten, my cat reaction at first was hissing too. But I kept telling and reassure my cat, that the new kitten is nice and will be good friend. that night, she kept butting my kitten, until time to sleep. My cat sleep with me and new kitten i put him sleep in basket. the next morning, my cat wakes up as usual in happy face not until she sees the new kitten that she starts to growl and attack her. it made me so upset, but, I'm glad I took the kitten on Friday night that I can keep my eyes on them over the weekend. But slowly they can accept each other smell, and by Monday, the new kitten already leapt on my bed and sleep with me. At first my cat was so furious that she want to sleep in the bath tub (I put her in the bathtub for couple of hours with new kitten since they keep fighting on saturday, but in the bath tub they not fighting, I guess they understand that I feel so frustrated).But when both felt asleep, I took my cat to sleep with the new kitten. It takes couple of days before they willing to fall sleep together. Now, after been couple of weeks together, they can play and sleep together although sometimes include rough play (believe me, it's not my cat who provokes the fight, but my kitten like to hunt my cat tail). what I'm trying to say, it's not good to separate them together for long period. You just have to keep on eyes when you first put them in the same room. Give them few days, and if it's not working, maybe you shouldn't keep that kitten. it's not fair to leave the kitten in bath room since they also need more attention and love from you.
Good luck with your situation. Just be patient, if the kitten meant to be in your house, they will get along very soon.

It really all depend on the type of temprament each of the cats have. We had a similar experience not so long ago when we brought our 3 month old kitten home. Our then 7 month old kitten hissed at him through his carrier. We seperated them for about an hour and poured attention over our older kitten. Then we let our new kitten out of the bathroom and roam around a bit under our supervision. Our older kitten wasnt too hapy and she did go and attack, but we put a stop to anything that would harm our new kitten. I would keep new kitten in the bathroom when you are out, you will notice that your older cat will go to the door of the bathroom and sniff and just sit and listen because they are so curious as to what is behind the door. Let new kitten out for a few hours while you are home so she can explore and get used to you and the surroundings, just keep a keen eye on your older cat. She will be very curious and may go over to sniff new kitten and attempt to attack her, let them go for a while, but when one lets out a distress call, its time to intervene. This could take anywhere from 3 days to three months! We were lucky with our two, it only took them a few days until we could happily leave the youngest out while we were at work. Of course our older one didnt want anything to do with us for the next few wekks, but eventually they will come around. It is important for you to let you new kitten roam around, but dont put your older cat in a room while this is happening. She will think she is being punished and will only create more problems when you want them to get along. Our oldest kitten is now 9 months old and the younger is 5 months. They are the best of friends (most of the time) and the only time they really fight and hiss at each other is over claim of food or someones lap. So good luck with your cat, believe me its all worth going through, they are so funny to wath when they play with each other!