Benadryl for dogs suffering with allergies and other conditions. (redirects here from diphenhydramine). Donât use Benadryl for dogs without reading this first! The Benadryl dosage for dogs, safety precautions, side effects and other important information is included below.Uh oh! AdBlocker detected! Dose My Pet is a website which can only stay online through ad revenue.enadryl for dogs suffering with allergies and other conditions. (redirects here from diphenhydramine). Donât use Benadryl for dogs without reading this first! The Benadryl dosage for dogs, safety precautions, side effects and other important information is included below.