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Dogs cough for a variety of reasons, some of which can be serious in themselves and others that are signs of an underlying problem. Internal parasites, heartworm disease, distemper, fungus diseases, tuberculosis, allergies, and pollutants such as cigarette smoke can cause Fido to cough.
At this time, the most likely disorder would be kennel cough which is called infectious tracheobronchitis. This is an infection of the upper respiratory tract that can cause dogs to gag and cough excessively. He could have contracted this from another dog at the dog park. Many dogs with kennel cough with cough so much that they can even vomit up food from their stomach every now and then.