How Much Robitussin Should I Give A 5 Pound Dog?

How Much Robitussin Should I Give A 5 Pound Dog? –Dextromethorphan (Robitussin DM with dextromethorphan at 10-15 mg/5ml and Guafenisin at 100mg/5ml), for cough. Roughly, 1 teaspoon per 20 pounds for dogs. Can small dogs take Robitussin? Never give your dog Robitussin without the approval of your veterinarian. Can you give your dog Robitussin? If