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Some causes of coughing in dogs include kennel cough or other respiratory infection, irritation from pulling on his collar, heart failure, foreign material in the airway, heartworms and lung cancer.
Side Effects of Delsym
Delsym may cause drowsiness or upset stomach in your dog. Administer the medication with food to minimize side effects. Irritability, confusion, excitability and nervousness may be a sign of a more serious side effect. If you see these in your dog, contact your veterinarian immediately. Medications that depress the central nervous system may interact with Delsym.