Great Dog Breath, Batman!
My Chakli (Coal, in my language) smells my breath whenever I get back in the pickup after going into a store, & his reaction to food smells is markedly different from non-food smells. It's a lot like being a teen-ager again, & having my breath smelled to see if I had been drinking. If I don't bring him something from the table, I get The Dirtiest Looks.....
His predecessor, Wa Ska (Snow White, in my language), could scent rattlesnakes at a solid 100 feet, & she would snarl like a tiger. Considering her otherwise sweet disposition, this was a great thing, since I live in the country..
My dog who went to university with me, Sandy, was deadly about marijuana, & would bite anyone who had that smell on them.. GOOD DOG, Sandy! And Sandy was never wrong about whether a person was friendly or dangerous, either. Handy if giving rides to hitchikers in bad weather - they put their hands up near the window-opening & let him smell them. If he wagged his tail, they were good. If he tried to eat the glass, they had to look for another ride. And he was absolutely never wrong, in 17 years..
All of them natural (ie, not taught / learned behaviors). This is nothing new. But is good to see just the same.