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Location and grade of tracheal collapse (TC) occurrence on fluoroscopy by dog breed. An illustration of the distribution of TC among (A) the total dog population (n = 110). (B) Maltese (n = 34). (C) Pomeranians (n = 25). (D) Poodles (n = 17). (E) Chihuahuas (n = 8), and other breeds (n = 26). TC severity was assessed based on the percentage of maximal reduction in luminal diameter as follows: grade 0, 0%; grade 1, 25%; grade 2, 50%; grade 3, 75%; and grade 4, 100%.
