Here are 10 incredible scientific discoveries about dogs.

Dogs are perhaps best known for being loving and loyal, but they also have a bevy of lesser-known and quite fascinating traits.

Here are 10 incredible scientific discoveries about them.

Number 10. They have 3 eyelids. Like people, dogs have top and bottom ones that move up and down. They also have one that originates in the corner of the eye and moves side to side. Its purpose is for clearing mucus and debris. 

Number 9. Dogs really do love their humans. There’s scientific proof of it. MRI scans revealed that when presented with the scents of various people and canines, the reward centers of the dogs’ brains were most responsive to the aromas of th