 [ Symptoms ] how much zertec allergie medication do i give my 110 lb dog [ Disease ] i am sorry your dog is having allergies well this is primarily a forum for human health questions but since i am a dog lover i will answer your canine conundrum are you sure the problem is allergies the symptoms of allergies such as nasal allergies or hay fever are very different in dogs than in humans if you have any questions at all about whether or not your dog is truly suffering from allergies you need to consult a veterinarian my understanding but do not take that to the bank is that zyrtec generic name cetirizine is safe for dogs i do not know the dosage however you can call a 24 hour animal hospital and they will probably be happy to tell you diphenhydramine brand name benadryl is safe for use in dogs it may be a better choice than cetirizine in fact but you should consult a veterinarian for specific dosing instructions for your dog i hope your pup feels better soon