Can I Give My Dog Diphenhydramine?
Yes, with care
Diphenhydramine is commonly referenced for dogs at published doses. The published veterinary reference range for diphenhydramine in dogs is 2-4 mg per kg of body weight, given every 8-12h. In practice: 1 mg per lb (2.2 mg/kg). Plain diphenhydramine ONLY, combination products (with decongestants or acetaminophen) are dangerous. Drowsiness expected.
Source: Merck Veterinary Manual
Skip it or ask a vet first if
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The safe habit
Confirm any medication decision with your veterinarian, who knows your dog's health history and other medications. VetDose shows published reference data, not prescriptions.