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Greetings, I’m Dr. Peck, a small animal veterinarian in general practice. Hopefully I might be of some help. One moment while I reply…
I would suggest bathing her thoroughly to remove what you're able to of the topical product from her skin. Then administer benadryl at 1-2 mg per lb of body weight (so a 50lb dog would get 50-100mg by mouth). Benadryl comes in 25mg tablets. Start at lower end but don't hesitate to give higher end dosage if she doesn't appear to get relief from her itchy skin on the low dose.
Try a different flea control product. Sometimes reactions like this occur, with any product, but usually something they won't react to is easily found.
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