Benadryl, the brand name of the generic antihistamine diphenhydramine, is not labeled for use in dogs but has remained a popular choice among veterinarians, dog groomers, and dog-owning families ...

The rule of thumb is to administer 2–4 mg of Benadryl per kilogram of body weight. Read on to learn more about the medication as well as how and why it can be used to treat dogs, its side ...