Tea leaves contain theobromine. Theobromine is even more toxic to cats than it is to dogs - it's just not usually a problem because cats aren't as interested in scarfing down their people's chocolate.
Don't worry, I wouldn't actually give something weird to him without checking with the vet first! The sort of stones that green tea ostensibly helps prevent are not the sort that he has, anyway.
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Tea leaves contain theobromine. Theobromine is even more toxic to cats than it is to dogs - it's just not usually a problem because cats aren't as interested in scarfing down their people's chocolate.
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