It is not uncommon for dogs to cough occasionally. However, if your pet is coughing frequently or has persistent episodes of coughing then you should seek advice from your veterinarian. There are many causes of coughing and many of these can be treated successfully. Some dogs occasionally cough when they get excited or pull on their lead. Many causes of coughing if left untreated, can progress over time causing severe consequences for your pet. If your dog develops a constant cough, an intermittent cough that does not get better after 2 weeks or becomes at all unwell then you should make an appointment to see your vet.