One of the goofiest radiographs I have. This is a small-breed dog who is grossly obese and also exhibits a collapsing trachea. Gas is radiolucent, meaning that it shows dark grey to black on radiographs; hence the trachea is usually easily visible on its passage from the larynx to the bronchial tree. In this dog, you can see it narrowing suddenly. This dog likely had a honking cough that worsened with exercise, excitement, or leash walks with a collar. The first line of treatment is to get the dog a harness for walks, start a weight loss regimen, and make sure the dog avoids strenuous exercise.
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