shihtzu dog breathing pattern
my shih dog, and i think not just him, also my other shih dogs (age: 1-3 yrs old) keep breathing like this when they're about to sleep. I'm not sure if this is normal because they have a small nose/nostril. This mostly happens when they're still conscious. But when sleep is deep, I don't notice them breathing fast like this (or maybe they do, I just don't notice well).
I live in a tropical country so it's very hot, especially when summer hits. That's why I always have my air conditioning open for almost 24/7 because of the heat.
I also have other shih dogs whose furs aren't fluff like this (they look like Chihuahuas with their furs), but they don't breathe like this. Could it be an issue with the fur keeping the heat in their body?