If Rascal has no health issues prompting the behavior, the spraying likely relates to territorial marking behavior. Even if the cats get along well, Rascal has become used to leaving his little pungent messages around. He’s doing what comes naturally for a cat. The Creator made him this way–there’s nothing broken or in need of repair.
The product Feliway, an analogue of the cat’s cheek pheromone, sometimes can help eliminate or at least reduce spraying behavior. You can find this at pet products stores. Basically, you find all the spots he’s sprayed (use a black light if need be to make them shine in the dark so you can see them). Clean up the places thoroughly with an odor-neutralizing product. If any scent lingers, he’ll continue to return and refresh those odors. Remember, just because YOU can’t smell it, doesn’t mean that Rascal can’t detect this. Once it’s clean, you spray the Feliway onto the spot. Cats tend not to spray on top of cheek-marked objects, so using the Feliway can help keep him from spraying those spots. But he may, indeed, find other places.
If the Feliway does not work, my best advice would be to find him another home where he’s the only cat–or at least doesn’t have to compete with three other felines. If he doesn’t have to argue about territory, he shouldn’t feel as much need to spray urine.
More: continued here

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