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Hello, I'm Dr. Deb and will do my best to help you today.
I would agree that if your Dachshund has developed hives and perhaps is itchy, that she may be having a reaction to something ....although we may not know exactly what that "something" might be.
But regardless, the appropriate dose of Benadryl (Diphenhydramine) for a 20 lb dog would be 25 mg twice a day. Sedation is often a commonly seen side effect so be prepared for her to be a little drowsy.
Some dogs will require stronger drugs such as steroids before hives resolve but the largest percentage will respond to Benadryl.
I hope this helps. Deb
I'm just following up on your Dachshund. How is she doing today? Deb