Help make this go viral please....

Nice cats yall! Here is the latest Scruff update. Scruff has developed "some kinda" skin allergy. We've been battling it about a year now. It's made him very skiddish and he retreats to under the bed or under "whatever" he can get under and just hides. Well........the vet "FINALLY" hit on something. Now Scruff is real happy as all his allergy sores are now completely gone and healed up. He is one happy cat now.

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What did they 'hit on" ??