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Benadryl is the best only in really bad cases steroids are necessary. Benadryl is 1 mg per pound of body weight but if a bad reactions happens you can give more. 2mg- 3mg per pound is ok for a bad reaction. So if you dog weighs 40lbs you can give up to 100mgs as an initial dose to help then you can back off to the normal 1mg per pound. You can also give 3 times a day if needed for the first day. It should be ok as long as he has no trouble breathing.