Antihistamines don't work well in a lot of dogs. And they really don't work well for food allergies. So I'm surprised they are really helping. Are you sure there isn't an environmental allergy and the food just pushed her over the threshold?
Could take days, but up to 12 weeks.. What is she allergic to? Lots of Yorkies get itchy from RC. My girl did. Great brand, but unless they have a hydrolyzed formula, there are probably better choices for dogs that are already itchy.
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