Benadryl is safe to use in dogs, and the dose is approx. 1mg/lb every 8-12 hours; I have used 25mg twice daily in pets slightly under 20# with no ill effects. In approx 10% of dogs, any antihistamine can unexpectedly cause excessive sleepiness, or paradoxical excitment, and if these symptoms occur, then the antihistamine is discontinued. Perhaps this happened to one of the prior rescue dogs when given benadryl. Antihistamines are helpful to decrease itch in 30-40% of pollen allergic dogs, and sometimes multiple antihistamines have to be tried in order to find the most effective one for each individual dog, so if benadryl is not helping after 1-2 weeks, you can certainly try zyrtec.
Kimberly Coyner, DVM DACVD
Copyright 1994-2016 MedHelp International. All rights reserved.
MedHelp is a division of Aptus Health.
This site complies with the HONcode standard for trustworthy health information.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.