I do beleive the dog is born with the trachea problem but somtimes later on life as they age it causes problems for them due to the heart being enlarged or being over weight (my mother in law has a overweight dog and he just started coughing and vet said it is due to him being overweight and it is pressing the trachea. He always had a weak trachea but never had symptoms from it until he gained the weight. |