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Claritin, like many drugs, is an off label use and the safety has not been readily studied.
Has your vet prescribed basic antishistamines?Dr.V
Some derm vets actually comment that they see less of a response than with hydroxyzine (atarax) and chlorpheniramine and sometimes benadryl.
The typical approach is OmegaFatty Acids (dermcaps) and antihistamines and topicals...and avoid steroids!
The benadryl doesn't knock them all out..it is worth trying...but I would call your vet on Monday and ask for Hydroxyzine...it is usually the first one we try.