My new cats aren't territorial. Will they start fighting later?

It is possible Buffy and Layla could become aggression toward each other but it's not guaranteed. I'd definitely recommend getting both of them neutered by 6 months of age as this may cut down on fighting. You may also want to purchase a Feliway Multicat diffuser as this will decrease tension in the household. Make sure to Rotate toys for both cats, have at least 3 litter boxes, and a few cat towers where Layla and can get away from each other if they need a break. Thanks for using Petco Pet Education Center, formerly Petcoach and good luck!

If your older cats have been together for several years, they probably have their "territories" picked out. It is quite possible that they just don't like each other. Having more than one pet is often like being placed with a roommate that you didn't choose - sometimes it is a great fit and sometimes you can't wait to move out! It is hard for me to tell you if getting new kittens will help or hurt the current situation, as it would just depend on how happy your current cats would be with new, and very young roommates. Kittens like to play, a lot, and often need to be taught the rules of the house. There will likely be a lot of fighting at the start until the kittens grow up a little. There is a possibility that kittens will help the other cats mellow out together, but my gut feeling is that this may not happen. If you do decide to get new kittens, remember that you will need a drastic increase in litter boxes (and feeding stations and water bowls). Veterinary behaviorists recommend 1 more litter box than you have cats, so that means 6 boxes! And they all need to be in different areas of the house to give a sense of privacy. You will also need additional quiet space so that everybody can feel safe in their own area.

It could be that they are fighting for dominance, or they could be playing flighting with each other. Given that there is no aggression in the fighting (i.e. biting), it's more likely they are just playing with each other. It could also be that one gets annoyed at the other, they argue over it, and then get over it. It's natural for cats who live together to have incidents like this, and as along as there is no biting or aggression, it's not something to be too concerned over :-)

This happens. Cats take time to get used to each other. It can take 6 months before they are either friends or tolerate each other. I have 5 cats, and two of them keep having tiffs when their paths cross, however, in general they get along by ignoring each other. Make sure your new kitty is checked for FIV and FeLV as these diseases are spread by saliva (deep bites when fighting) and also have the new cat vaccinated against rabies. Most cat fights are loud with lots of hissing, spitting and screaming but hardly any injuries....so they sound far more dramatic than they are. Give them time. Eventually peace will rule.

Most chances you will never really need to, cats usually spend ages making those ridiculous noises and then after abut 10 minutes of doing nothing they will fight at a lightning speed for 1-2 seconds and then one of them will run away from the scene.

Cats in general are hard to introduce to each other - they don't generally get along, especially at first. Number one, you may want to consider having Meepo [neutered](https://www.petcoach.co/article/benefits-of-neutering-castrating-male-cats-kittens). That usually lessens the aggression/moodiness and makes them more mellow. Number two, I suggest you get some [Feliway diffusers](https://www.petco.com/shop/en/petcostore/product/feliway-30-day-multicat-diffuser-plug-in-starter-kit) for the house. These often work wonders. I don't think his personality will be permanently changed. Finally, in the future, be sure to [introduce new cats](https://www.petcoach.co/article/bringing-home-a-new-cat-or-kitten/) to each other very gradually. This will minimize tension. Hope this helps. Best wishes.

My guess is that you did not do a gradual introduction with them?? If not, you may have to go back and revert to doing that along with these other recommendations. ( https://www.americanhumane.org/fact-sheet/introducing-cats-to-cats/ ) I recommend you put some Feliway diffusers (Multicat) in your house and do some environmental enrichment for them. Usually these two things help. ( https://www.feliway.com/us/Products/FELIWAY-MultiCat-Diffuser ) ( https://www.feliway.com/us/Why-Use-Feliway/how-to-stop-cats-fighting ) ( thedrakecenter.com/materials/environmental-enrichment-indoor-cats ) Hope this helps. If you have more questions you can always opt for a private consultation where we can chat back and forth. That way you can ask as many questions as you'd like. Best wishes.