Benadryl Dosage Calculator for Dogs
General Benadryl (diphenhydramine) reference. Always confirm with your vet first.
⚠️ Confirm any medication and dose with your veterinarian before giving it. Use ONLY plain diphenhydramine — never a product with added decongestants, acetaminophen or other active ingredients (those can be deadly to pets).
The math behind it
A widely cited reference dose is about 1 mg of diphenhydramine per pound of body weight, given up to 2–3 times a day. Your vet may adjust this.
Worked example
A 30 lb dog → about 30 mg per dose.
FAQ
Is this medical advice?
No — it's a general reference. Dosing, suitability and frequency must be confirmed by your vet.