Which domestic animal can smell not only through its nose but also by opening its mouth?

it is so clever that dogs can detect drugs inside suitcases through this organ.

whatever, cats do it too.

Cats have this too. Ever seen a cat open up its mouth and expose its upper lip as if to give a look of disgust? That's the cat using this organ.

cats do it too.

arohanui, the question doesn't repeat itself, it's the description that repeats itself.

Fee, your question needs proof reading, it repeats itself