So here we go...I have a 1 1/2 year old golden that has had an allergic to something. As far as I can figure out it is Revolution brand flea, tick, and heartworm medicine. It is applied directly to the skin. Long story short, Addison had the medicine applied to her on Wednesday night. (She has been getting this medicine for the past year so it's not new to her.) Thursday she wakes up with a swollen face and hives. She is taken to the vet and given Benadryl and steroids. This all seemed to show improvement until the meds wore off. Now she has been back and forth to the vet mulitiple times for injections and medicated baths. The problem is she still has hives and seems to be very uncomfortable. We are doing everything the vet has said but still feel heartbroken and helpless. Anyone have any ideas or have you had a bad experience with Revolution?