And Now For Something Completely Different

Montanarchist said:

I am curious how he'd react if a friend brought her fixed male cat for a visit though.

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They will probably fight with each other. Cats are not like dogs, it isn't really a good idea to try to introduce "playmates" unless they are staying permanently. They aren't pack animals and even though at one time I had 22, there were still those who preferred to stay in their own "safe zone". Some would buddy up, but mostly siblings.

Not only that, but if you make him feel threatened, he may start to spray to mark his territory. Tom cat urine is nasty and if he doesn't do it now, whatever you do, don't get him started.

I have always had at least 3 or 4 (22 was a bit much, but wasn't really my idea, people kept dumping pregnant cats at my house. I was getting them fixed and "was going to" find them homes. Well, I did. Mine) Anyway, I am the proverbial cat magnet. If there is a stray, it will come to my house. If I go anywhere, they come up to me.

Montanarchist said:

I wondered about that, but he did really well when my son's dog was here for a few weeks. He even started to play with the dog.

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Several of my cats play with my dog(s), but not with the other cats. Not sure if it is because it is a different species, but there has never been a problem with that. I wouldn't take a chance, especially with the unneutered status of your male.
But, if you do, good luck.

The difference is that cats that have grown up around cats and a cat that is a single. Any group of cats will eventually interact with each other in different ways, but a solitary cat will generally take much longer to interact in a "friendly" way.