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Hi, this is Dr. Sara. Is Snuggles an indoor only cat? Has there been any vomiting, diarrhea, straining in the litter box?
If he is around the litter box, I would be concerned that he is having trouble urinating. At 11y/o he may have an inflammation of his bladder possibly due to ageing kidneys or he may be blocked. Are you able to feel his belly, up under his hind legs(deep) to see if he is painful there or if you feel anything like a lemon or orange(very firm)?
Were you able to feel his belly?