How to give benadryl to dogs for allergies

Benadryl, with the active ingredient diphenhydramine, is an antihistamine. It can provide your dog temporary relief for allergic reactions caused by bee stings, insect bites, vaccinations, snake bites and can provide relief if your dog is itching because of a flea allergy or food allergy. If you give your dog benadryl for itching associated with a food allergy, it will only treat the symptoms for a short time. You will still need to take your dog to a veterinarian for a definitive diagnosis and treatment.

Select the product you will give your dog. There are many different types of benadryl available. The type of benadryl for your dog should be in capsule or tablet form. The liquid forms contain too much alcohol to be used safely for animals. Check to ensure that the only active ingredient in the product is diphenhydramine.

Weigh your dog. Your dog will take 1 mg to 2 mg of benadryl per lb. of body weight. This means, for example, that if your dog weighs 10 kg (25 pounds), the pet can have 25 mg to 50 mg of benadryl.

Roll the benadryl pill in peanut butter.

Offer the benadryl medication in its peanut butter coating to your dog as you would a treat.

Give your dog benadryl again in eight hours, if symptoms persist or return.


Benadryl will likely have a mild sedative effect on your dog.


Do not give your dog benadryl if your pet is taking medication for glaucoma, hyperthyroidism, cardiovascular disease, lung disease or an enlarged prostate.

Things You'll Need

  • Benadryl, capsule or tablet form
  • Scale to weigh dog
  • Peanut butter
Cite this Article A tool to create a citation to reference this article Cite this Article

About the Author

Bethney Foster is social justice coordinator for Mercy Junction ministry, where she edits the monthly publication "Holy Heretic." She is also an adoption coordinator with a pet rescue agency. Foster spent nearly two decades as a newspaper reporter/editor. She graduated from Campbellsville University, receiving a Bachelor of Arts in English, journalism and political science.