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Tracheal collapse is a chronic, progressive, irreversible disease of the trachea, or windpipe, and lower airways (mainstem bronchi collapse).The trachea is a flexible tube and, similar to a vacuum cleaner hose. It has small rings of cartilage that help keep the airway open when the dog is breathing, moving or coughing.racheal collapse is a chronic, progressive, irreversible disease of the trachea, or windpipe, and lower airways (mainstem bronchi collapse).
The veterinary community isn't exactly sure why collapsed trachea in dogs occurs, says Dr. Kim Wilson, a veterinarian also at Florida Veterinary League. It seems to be a congenital abnormality which causes the cartilage in the rings of the trachea to be weaker than normal in some dogs, leading to the collapses..