Sadie has been "coughing" for several weeks now. She makes these loud coughing sounds almost like whooping cough. We had her to the vet when she first started doing it and he could find nothing wrong with her - nothing in her throat, lungs are fine. But she is still doing it, mostly at night. I just wondered if anyone else's labradoodle did this. I suppose it could be allergies of some type? She seems perfectly healthy otherwise.