Always consult your veterinarian before giving Benadryl to your dog. The correct dosage of diphenhydramine for dogs depends on their weight. A small dog will need much less than a big dog to ...

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 ...