I would probably get all kinds of diseases if I sniffed every bare asshole from every mammal I meet, humans included. I’d definitely get sick if I sniffed a dozen random turds a day. But dogs can do it without any apparent issues. Not only that, but they can do it across different species of animal, too.
What dark arts are afoot within the beak of the dog?
No they don’t? A human has ~9000 taste buds on average while dogs have ~1600ish.
Their noses are way more sensitive than ours but we have way more taste buds than dogs do.
Dogs have specialized taste buds on the tip of their tongue specifically designed to taste water, a feature not found in humans