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what should we do about our cat?

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I moved in with my sister about 4 months ago, I brought my cat with me, she has 2 cats. They are all male, my cat is used to being dominate male, and so is one of her cats. They fight constantly, well about 3 days ago her cat started peeing on the couch. We are wondering if it has to do with my cat or if we should take him to the vet just to be safe.