The best dosage for dogs to drink cough syrup is half the dosage for children. Do not feed too much, because cough syrup contains more sugar. Feeding too much will cause side effects and increase gastrointestinal burden on dogs. When feeding, you can mix it in the water the dog drinks or in the dog food. If the dog does not drink it by himself, you can use a syringe to extract an appropriate amount of cough syrup, and then inject it into the dog's mouth bit by bit. Be sure not to inject it all at once to avoid choking your dog.