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I have been told CT can develop in a normal trach.
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With sufficient trauma I suppose it could, but most experts link it to a protien deficiency:
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We do not completely understand how this condition develops. However, we know that these dogs have an abnormality in the chemical makeup of their tracheal rings. The rings lose their stiffness so they are not able to retain their circular shape. We also know that it occurs in certain breeds of dogs, notably Chihuahuas, Pomeranians, Shih Tzus, Lhasa Apsos, Toy Poodles, and Yorkshire Terriers. Because of that, we suspect that there is a genetic factor involved.
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http://www.fourpawsonly.ca/canadian_...h_trachea.html
There is a CT exam you can perform as a minimal screening effort. It detects a mildly symptomatic dog that might not otherwise be noticed as having the defect. If you guys already know this, please forgive me. It's a 1 minute tracheal massage. Gently scratch the dogs chin and go down to scratching along the throat, occasionally massaging the area of the trachea from the top all the way down to the chest. You should be extremely careful and monitor the dog's responce to this, lighten up if you see any discomfort. If your massage, during this minute, provokes a honking cough then you probably have a CT dog. If it provokes a backwards sneeze or other coughing and distressed respiration, then it's a troubling sign and should be monitored.