Tracheal Collapse in Dogs
Tracheal collapse is a commonly encountered cause of airway obstruction and coughing in the dog. The cause remains unknown, although there may be many factors involved. The most likely cause is abnormal synthesis of the cartilage that is part of the structure of the trachea. The disease causes dogs to cough in spasms.
Either sex may be affected, although it is almost always a disease of toy breeds. Yorkshire terriers are the most commonly affected, but Pomeranians, Chihuahuas, poodles and Maltese are also predisposed. It may affect dogs of any age, although the average age at which clinical signs first appear is six or seven years.
What to Watch For
Signs of tracheal collapse in dogs may include:
Diagnosis of Tracheal Collapse in Dogs
Diagnostic tests may include:
Treatment of Tracheal Collapse in Dogs
Home Care and Prevention
Administer medication as prescribed. Use a harness instead of a collar and treat any concurrent conditions that might exacerbate the tracheal collapse. Isolate or remove the dog from any potentially irritating substances such as cigarette smoke or excessive dust.
In-depth Information on Tracheal Collapse in Dogs
Tracheal collapse is a common cause of airway obstruction in dogs. The condition was first described in dogs in 1941. The trachea (windpipe) is normally a rigid circular tube. Typically, if the trachea collapses, it is compressed from top to bottom, as opposed to side-to-side. The section that collapses is usually the part of the trachea that enters the chest, but it can occur anywhere, from the throat all the way down to the first part of the lungs.
Tracheal collapse is mainly a disease of toy-breed dogs of either sex. Yorkshire terriers are most commonly affected, but Pomeranians, Chihuahuas, poodles, Maltese and pugs are also predisposed. Any age dog can be affected, but the average age at which clinical signs first occur is usually six or seven years.
Dogs are brought to the veterinarian with a history of coughing for several weeks or months, although, less commonly, it may present as a sudden episode. Other possible presenting signs are intolerance to exercise, labored breathing and cyanosis (bluish tinge to the gums). Excitement, eating, drinking, irritants like smoke or dust, obesity, excitement and hot or humid weather may provoke a coughing spasm.
The cause of the collapse is unknown, but there are probably several factors at play. Abnormal synthesis of the components that make up the cartilage found in the trachea is believed to be the cause of tracheal weakness. The weakened trachea flattens from top to bottom, obstructing the flow of air in and out of the lungs.
There are other possible causes of tracheal collapse, such as congenital defects, chronic airway disease, trauma and tumors that compress the trachea from the outside. There are other conditions that can cause coughing, and this can exacerbate the collapse of the trachea. For example:
Once collapse has occurred, coughing will perpetuate further coughing by causing irritation and inflammation of the trachea. The irritated trachea will produce mucus and other secretions that further obstruct the airway. Medical treatment is undertaken to try to break the cycle of coughing, inflammation and excessive mucus production. If medical therapy fails, surgical therapy may be attempted.
In-depth Information on Diagnosis
Diagnostic tests for tracheal collapse dogs may include: