You would have to find out what dosage for the cat's weight. A friend of mine only gives her cat a quarter of a tablet everyday for skin allergies. I have my dog on Benadryl and it must taste really bad because unless I can disguise it with something really smelly he spits it out. I am sure the cat would be the same way as far as trying to disguise the taste especially if you cut the tablet
It might help. But could be allergies. Try benedryl.
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