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Usually cats with a tendency for this need a special diet, but that depends on the kind of blockage he had. Sometimes they get them due to an acidic diet and others due to a basic diet, and the changes you have to make depend on that. Sometimes you have to cut on their protein intake. But really, your vet should have informed you about all this and suggested a special diet from now on, or else it just looks like he's waiting for it to happen again.
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