How Dogs "See" The World Using Their Powerful Sense Of Smell

The visual acuity of our canine companions is about 20-40% as good as ours. But the average dog's nose is 10,000 times more sensitive to odors than the human nose. As this fascinating TED-Ed video shows, they don't so much see the world as they smell it.

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Brigadier PF Diamond McYemen

But why do they stick their noses in each others arses? If they can pick out a perfume in a Stadium, why can't they smell whatever they need to smell without getting right in each others asses