Unneutered male cats are always a wild card. If you take time to introduce them, such as keeping them in separate kennels for a couple of days so they know the other is there and are curious, then you're less likely to have a violent or stinky demonstration of territory. My neutered male cat made an excited fuss at the apartment window one day, and we realized there was a big kitten out on the porch.
He usually hissed at other cats, so his enthusiastic interest in this one was a good sign. We ended up adopting her when no one claimed her. Upon her return home from the vet to be spayed, we did the two-kennel separation for a couple of days.
One quiet evening I opened both kennel doors, and stood back. After a few minutes, I heard a "scritch scritch scritch" as he dug in the box in her kennel after peeing in it. About an hour later I heard a "scritch scritch scritch" in the other kennel after she took a dump in his box.
They did very well together. No spraying.
Male cats are able to start spraying at six months of age. A male cat may spray for one of several reasons such as: in response to a fearful or frustrating situation, to mark their territory, or to say they are sexually ready. Just the fact that you are bringing another cat into the household will most likely cause him to start spraying.(as if to say to the new cat hey this is my house and I was here first.) I highly recommend that you have your cat neutered when he is old enough or at least by six months.
The male spray smell is one of the most difficult if not imposable to get out of anything.
Yes he might.. I wish you had said his age.... if he is a kitten it isnt as much of a concern, but some older cats will spray to mark territory because that is what cats do! I would also be concerned if he is up to date on vaccinations - do not foster if he isnt.. also keep in mind a rule of thumb - one litter box per cat! Please be aware neutered cats don't have risks of some health problems like certain cancers.
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