Dogs cough for a wide range of reasons. Some cough simply to clear their throat of dust or debris. Other times, your dog's cough is a sign that something isn’t right. They could be sick or have something stuck in their throat that they swallowed accidentally. While the occasional cough is often not a cause for concern, frequent coughing is. If anything you’ve read so far sounds applicable to your pet, a trip to the vet may be in order.