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Hello and thank you for your question. I am a Veterinary Nurse with over 15 years experience and I have assisted in the care of many pets with this particular medical concern. It would be my pleasure to assist you today. Is it possible for me to obtain some additional information from you about your companion?
1) Can you post pictures of the cheek swelling you're seeing? 2) Has he stopped vomiting or does this continue? 3) Any diarrhea?
Hi again. The max dose of cetirizine would be 2 mg/kg body weight, so the max dose for Scrappy would be 18 mg. Unlikely to see any ill effects from the extra 2 mg.
Also, since his allergies are seasonal, talk to your local veterinarian about starting him on Apoquel (prescription) for the few months that he has issues. It works very well and can be stopped without tapering the dose. Take care. Let me know if you have any follow up questions.