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When two cats are using the same litter box it is like a competetion to keep their scent prevalent. This is even more so the case when the cats are un-neutered males. Male cats urine becomes more strongly scented as they mature. When they smell a female in heat (even one that is outdoors) they will urinate more frequently in order to attract her. The cat who attacked you was most likely sexually hyper and became angry when you removed his dominant scent. Even the friendliest of cats can become aggressive when they are sexually charged up. Perhaps a new female cat has moved into the neighborhood and your boys are anxious for her attention!
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