I read they have 100,000 times our smell capabilities, some breeds.
Cats have 5,000.
Incredible.
In fact, the turkey vulture has one of the best senses of smell in the animal kingdom. They can find hidden carcasses by detecting the methane gas that’s a product of decomposition — and this turns out to be one way they benefit humans: “They’ve used turkey vultures to detect leaks in cross-country gas lines because they’ll circle above them,” Dishaw says.-—http://www.vetstreet.com/our-pet-experts/10-fascinating-facts-about-vultures
She isn’t kidding, either... here in FL they can actually detect farts, but it frustrates them, because they are looking for something to eat and there’s nothing to be had but still lively grinning old men drinking beer by the driveway... A funny way to bring them in close, though.