
Think, in any situation with your dog, if you think your dog needs to see a vet then it probable does. No one can judge as well as the owner when their dog is in need of treatment and better too soon than too late. Vets never laugh as anxious owners they would rather you seek advice early.
Don't take the dog into the waiting room tell the receptionist that your dog is caughing and leave in the car till the vet tells you what to do.