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I'm very sorry to hear your kitty Bud is so painful. It must be hard to see him in pain. I recommend holding off on giving him any aspirin until he gets checked out by your vet tomorrow. Aspririn and other anti-inflammatories (NSAIDs) may cause upset stomach issues and/or serious kidney damage at the dose required to provide pain and anti-inflammatory relief. I would hate for him to develop a second problem while trying to fix the pain issue.