Last reviewed: June 2026
Dog Benadryl Calculator is published and operated by Archie Design App LLC, a software company registered in Wyoming, United States. We build free, focused online tools that help people get quick, clearly-explained answers to everyday questions.
This site provides a free calculator that estimates a common diphenhydramine (Benadryl) dosage range for dogs based on body weight, along with educational articles about uses, breeds, and safety considerations. It is an informational reference tool, not a veterinary service.
Our dosage guidance is based on the commonly cited veterinary guideline of approximately 1 mg of diphenhydramine per pound of body weight, two to three times daily, and is cross-referenced against publicly available material from recognized animal-health authorities, including:
Content is drafted by our editorial team using the authoritative sources listed above, then reviewed for clarity and accuracy before publication. We use software tools to help draft and structure articles, but every page is reviewed by a person against primary sources before it goes live. When guidelines or product information change, we update the affected pages and revise the "last reviewed" date.
This tool is for general educational and informational purposes only. It is not veterinary advice and is not a substitute for an examination by a licensed veterinarian. Always confirm any medication and dosage with your veterinarian before giving anything to your dog — your vet's prescription and guidance take precedence over any estimate shown here.
Questions, corrections, or feedback? Reach us at contact@archie-design.app or through our contact page.