New Bulldog owner. Question on my bulldogs breathing. Ok she is 11 weeks old. She is an active playful pup. At night she gets a cough. followed by a kind hairball type hack like a cat. She is starting to make the hairball sound during the day also. She eats, drinks, and is active all day long. It has me worried. She was at the vet a week ago and she got an all clear everything is ok. But I'm still worried. A lot can happen to a pup in a week. And she goes again in a few days. Any ideas? Stuff I should be doing?