I've yet to see a dog that likes Pepto.

You could try Cimetidine. For a 75+ lb dog the dosage is 200 mg twice daily. Also the Rantidine (Zantac) at 75 mg might provide more prompt blocking of stomach acid. Ask your Vet for the appropriate dose based on your dog's weight.

If the nausea persists a trip to the Vet, with possible antibiotics for possible food poisoning is in the offing- dogs do eat strange things. If the nausea is severe, you may wish to ask your Vet for Metoclopromide.