Can I Give My Dog Pepcid AC?

Yes, with care
Famotidine is commonly referenced for dogs at published doses. The published veterinary reference range for famotidine in dogs is 0.5-1 mg per kg of body weight, given every 12-24h. Give before meals. Plain famotidine only, not Pepcid Complete.
Source: Merck Veterinary Manual
Get the exact range for your dog's weight

Skip it or ask a vet first if

kidney disease (dose adjustment, vet)

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.