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Hi there. Sorry to hear that Rocky is having this issue.
You can try Benadryl for sure but you are giving too low of a dose. Dogs need a much larger dose than people as they metabolize it faster. The dose is 1mg per pound of body weight up to three times a day. So at 80# ***** would give him 75mg to start with which is 3 of the 25mg capsules.
Does that answer your question??