Unneutered male introduced to 2 other neutered males - questions about interraction!

I recently came across a unneutered male cat around 1 1/2 years old that I adopted and now brought into the household with 2 other male NEUTERED cats.

Now I plan on neutering this male within the next few days, however I did allow this cat to interract with the 2 other males just so the cats can get associated with each other.

To sum up about my other 2 cats, one cat is very solitary (was once feral and slowly going to a domestic route and is gradually warming up to human contact). My other cat is highly social, and a true lap cat. Both cats get along great and have no problems with eachother.

Now - once I introduced this new cat into the house, there were no real problems with the initial interraction. I had the cat in the bathroom away from the other cats at first so the 2 cats would realize there is a new cat in the house. After the initial introduction, I allowed the cats to finally meet.

At first everything went well, my 2 cats were both accepting of the new cat, a few chases going on, sniffing, and licking. Everythign seemed fine. However, the unneutered cat (Holiday), began to mount the domestic neutered cat (Sebastian), and proceeded to bite down on his neck and hump as if he were trying to mate. Now Sebastian became highly irritated at this and swiped him away and growled at him.

Once Holiday attempted the same action again with Sebastian in the presence of the once-feral cat (Bumpkins), Bumpkins ran after Holiday, hissing and swiping Holiday away from Sebastian. It seems as if they are not getting along now bc of Holidays very forceful nature, esepcailly int erms of the fact that he is still not neutered. Sebastian and Holiday get along fine as lolng as Holiday doesnt try to mount him, whihc just angers Sebastian, and forceS Bumpkins to come out of hiding and literally attack Holiday to get him away from Sebastian. As well as when Holiday attempts to go into Bumpkins hiding spots, Bumpkins hisses and growls at himt o get away.

I truly do not want this behavior to continue and really would like my cats to get along with each other. The thing is, will these behavioral actions change once I get Holiday neutered? Any suggestions? Opinions? Thanks

Welcome to TCS! I first wanted to say bless you for taking in an adult kitty I'm sure that the behaviour will improve once the neutering takes place, but there will still be an adjustment period.

I wouldn't call this not getting along, at least not to the point of having to worry about them EVER getting along. If they truely weren't going to get along, there would be bloodshed, scratched up and bloody kitties with bites and open wounds running around your house. They are fine.

Neuter the new boy, give it at least 3-4 weeks for his crazy male tom cat hormones to leave his system and then things should be a lot better. Up until that time though, I wouldn't let them have unsupervised play time together. Keep the new one in the bathroom when you are not around.

You can also buy some Feliway plug ins and sprays and use pure vanilla extract to get them to smell alike.

This is all typical behavior for a sexually-frusterated unneutered male now being contained within 4 walls with two other cats who just happen to be neutered males. He wan'ts dominence over them naturally and wants to mate with any moving object. Just be patient. You are doing the right thing.