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My dog ate too much Benadryl. Is an overdose harmful? What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | spayed | 6 years and 2 months old

My 6lb Chihuahua accidentally got a hold of my other dogs allergy meds 4 -25 mg Benadryl will it hurt her?

1 Answer

Most Helpful Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on March 23rd, 2018

Benadryl certainly can have some toxic effects in higher doses. And Nellie got a much higher dose than normal. At that dose, we certainly can see hyperexcitability including increased heart rate and muscle tremors. The safest option if Nellie just ate the pills would be to go to your veterinarian right away and have them make her vomit the pills. You may also consider consulting with the Pet Poison Helpline depending on when she ate the pills. http://www.petpoisonhelpline.com/ Good luck! I hope that was helpful and that Nellie is fine. Thanks for using PetCoach.

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