My two cats are from the same litter and hadn’t ever been separated , they got along and could be in the same room together and not fight. Now if they even see each other they hiss. One cat is in the basement and one is upstairs , but I feel bad because the cat in the basement doesn’t get as much attention as the one in upstairs. I really want to bring the one from the basement upstairs , but I don’t want them to hurt each other.
Their both females and their fixed.
a personality conflict
Have they been spayed/neutered? If not, this may be the issue.
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If they are both males it could be that they are becoming territorial. If it is male and female they could just not like each other. If female and female it could be that one is getting more attention than the other and the other is jealous.
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They have made their territories and are defending it. You need to Spay/Neuter them to help get the testosterone levels down a bit so they arent so edgy. There will be a bit of hissing when you mix them up but its ok. Just calmly break them up and send them on their way. Make sure to use vinegar and water to clean ANY urine sprays they have made. After a couple weeks (from spay/neuter) they should be A LOT better.
We’ve brought in completely strange cats to our house (in crates) and they hiss like crazy because of all the resident cats (4) and dogs (7). But.. they calm down eventually enough to be sociable. Dont be so worried.. they’ll start getting along once the "chemical" issues are dealt with.
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Feline/Canine rescue
a personality conflict
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