Which facial structure, inherited from the Pug, requires extra care regarding breathing and heat regulation?

Answer

Flattened, or brachycephalic, muzzle

Some Puggles inherit the flattened, brachycephalic muzzle of the Pug parent, a feature that directly impacts the dog's ability to regulate heat.

Which facial structure, inherited from the Pug, requires extra care regarding breathing and heat regulation?
DoghybridcharacteristicbreedPuggle