maybe he was attacked by a dog and he doesnt want to go outside because he is afraid whatever attcked him will do it again, having a litter box isnt really that bad….. it really doesnt take up much space either, i have 4 cats inside and thier litter box does pretty good, but anyway i agree you shouldnt make him go outside if he dosent want too cause apparently theres just something out there that scares him…. well good luck!
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