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Hello, this is Dr. Jess. I am sorry to hear about your dog! We do occasionally use Robitussin DM (make sure it is DM, and not one with added tylenol or phenylephrine or anything like that) in dogs. We usually give 1 to 2 mg of medication per kg of body weight, and each teaspoon of medication has 10mg in the teaspooon. How much does your dog weigh?
In some cases, this is not going to be a strong enough medicine for the cough and your dog may need prescription strength cough medication with something like codeine in it.
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