I've noticed my 7 month old male has a different breathing pattern than my 4 month old male. When they're both relaxing on my couch, the older one has a shallower more rapid breathing pattern than my younger one. It continues for several minutes until he falls asleep. The older one seems to "hang his tongue" out sooner on walks than the younger one too. That's opposite of what I'd expext for their age difference. There's no weezing involved, but I was wondering if anyone else noticed interesting breathing patterns when their dog is exercising, at rest or sleeping?