Question: how many milligrams of benadryl to give a dog?
Answer: As with any drug, the correct dosage of Benadryl for dogs depends on the dog's weight. Most drugstore diphenhydramine tablets, whether generic or brand name Benadryl, are 25 milligrams. The standard dosage for a dog is 1 milligram per pound of body weight, so one tablet is perfect for a 25-pound dog.