Can I give my dog human allergy medicine?

Can I give my dog human allergy medicine?
Common antihistamines like Benadryl (diphenhydramine), Claritin (loratadine) and Zyrtec (cetirizine) relieve allergy symptoms and allergic reactions. These medications are usually safe for dogs, but they can cause drowsiness or hyperactivity.

Reference:
Which Over-The-Counter Medications Are Safe For Dogs?
Oct 15, 2018

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