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Originally Posted by BamaFan121s

Wrong! Collapsing trachea can be caused by BOTH.
Please take the time to research things a bit further before you advise others, espeicially when it has already been stated and discussed by so many in the previous posts. You never know who is going to take what you post for fact and end up suffering the consequences because of it.

All sites discussing how collars contribute to collapsing trachea.
Tracheal collapse, collapsed trachea
Trachea Problems
Collapsed Trachea in Dogs
Michigan Veterinary Specialists - Collapsing Trachea

I appreciate your correction, but I'm still having trouble finding anything that says a collapsed trachea is anything but a genetic disorder. I will give you this: Of course a collar that is ill fitting or pulled too hard can "collapse" a dog's trachea. And, if your dog is suffering from a collapsed trachea it's best to use a harness. And, if your dog doesn't have a tendency to run out the door at times, it's probably best to let him run around this house without a collar or harness.

And, ill fitting collars cause all kinds of problems with both dogs and cats.

I just think there is a real difference between a genetic collapsed trachea, and the dog, through an accident, collapsing his trachea. Either is not good, and my condolences to anyone who's dog has a colapsed trachea or got caught up in a collar or harness.