Hives all over
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Allergies are tough. What changes in spring? Thinking of the obvious, you maybe are using sunscreen on yourself. Anything else you can think of that is different? Changes in laundry detergent, some new product in your house or car? Sure, could be something outside in the environment, but most allergens seem to have a season, I know they do for me. Hives all over the body....everywhere, or more in some areas? As far as keeping him inside, it might be worth a trial of a couple of days to see if anything changes....
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Yes, I have looked at the picture. My other concern would be the steroid shot he had. What informs me here isn't dog experience but my own. Treatment for a contact allergy rash I developed a couple of years ago was oral prednisone (steroid) and instead of helping it resulted in me getting a rash all over my body which lasted for over a month, and that was after only 3 pills. ( I discontinued the medication right after the 3rd pill because I experienced very serious side effects including slurring my speech and being unable to walk properly or dial the phone for help!) I now know I am allergic to Prednisone. It is a known side effect in humans and can be serious in some people, apparently including me. I think there is an outside chance that the steroid injection may be the cause of the ongoing hives, but that is pure speculation based on my own experience. Usually in canines Prednisone causes thirst, frequent urination, hunger, and a short list of more serious issues, but not hives per se. I don't know about other steroids or what your pup was given, so I am only putting this out there as a possibility.