Does your doxie have to sniff every blade of grass, too? LOL
I’ve read that it’s good for dog noses to sniff: 1) dogs enjoy it (we know!), and 2) it helps keep their noses “tuned up” for scent tracking—especially for hunting hounds who scent track like bloodhounds, beagles, and dachshunds, or search/rescue, dogs, police/military dogs who rely on their noses and physical abilities to save lives: Belgian Malinois, German shepherds, retrievers, etc.
Let ‘em sniff!