Although Benadryl is generally safe for dogs, some side effects can occur. Side effects usually occur within an hour of administration. They are typically mild and can include: ... Overdoses of Benadryl are more often caused by your animal getting a box of the medication from the garbage or medicine cabinet than by being given too much.PublishedDecember 4, 2025
August 12, 2022 -Dr. Ellen Malmanger discusses the symptoms of possible Benadryl overdoes in dogs and how it should be treated. Benadryl is often used to calm anxiety in dogs or to treat allergies.
March 6, 2026 -Capsules may also break open when chewed and deliver too much medication at one time, putting your dog at risk of an overdose. Your veterinarian can prescribe diphenhydramine tablets for dogs. Avoid using liquid Benadryl if it contains sodium, which can cause other side effects.
May 15, 2025 -Another consideration when administering Benadryl to your dog is the frequency. Even though the recommendation is 2 to 4 mg per kg of body weight, giving your dog Benadryl too frequently can also lead to an overdose.
July 1, 2016 -Abstract OBJECTIVE To characterize the signalment, dose response, and clinical signs of diphenhydramine toxicosis in dogs. DESIGN Retrospective case series. ANIMALS 621 dogs with diphenhydramine exposure. PROCEDURES The electronic medical record database for an animal poison control center ...
