Dogs have a second nose. (3/10)

Did you know that dogs have a second nose? Well, they do. The second nose is known as the vomeronasal organ, also called Jacobson’s Organ. 

The Jacobson’s Organ is a “sense of smell” receptor that is not receptive to ordinary odors like the ones humans can sense. So, dogs have a double nose, one that’s sensitive and another super-sensitive one.