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" ... Brachycephalic breeds of dogs present their own unique set of problems while being transported by air. Thanks to their snub noses, breeds such as pugs and bulldogs have difficulty in pulling a steady flow of oxygen through their complicated nasal passageways. At ground level that may be okay, but at an airplane's cruising altitude, which is pressurized to about six to eight thousand feet, the lack of oxygen in the air can be difficult for an animal to tolerate. On top of that, stressful conditions can frequently cause animals to hyperventilate and exacerbate any oxygen circulation problems. ... "