Bloodhounds are known as the best scenthound there is, which perhaps has something to do with the fact that their nasal membrane has a more vast surface area than all of their skin. They can follow a scent for up to 130 miles!

Bloodhounds have more scent receptors than any other breed of dog, totaling around 300 million of them. And those long ears aren't just for listening. They help sweep odors up towards their noses, increasing their ability to smell.

Bullmastiffs were trained not to bark or bite, so their reputation as vicious attack dogs are complete falsehoods. They were trained to be able to quietly track and hold down poachers.