Already exists as an alternate levitra prices of this question. i had a horrible allergies that i had to take zyrtec 10mg to treat. Answer. ) where. Zyrtec ia an antihistamine. Sinus & Allergy. Zyrtec is available in two forms; Zyrtec and Zyrtec D Pet allergy — Comprehensive overview covers symptoms and treatment of allergy to some pets. There are also Zyrtec combinations on the market with pseudoephedrine such as Zyrtec D Allergy and Congestion. For dogs, I’ll turn to Zyrtec when Benadryl (diphenhydramine) fails. While vets commonly recommend Zyrtec for dogs with allergies, it can have some severe side effects Zyrtec improves dog allergy symptoms such as itchy skin, runny noses, and watery eyes. Does anyone suffer with these conditions?