Cats can make over 100 vocal sounds, while dogs can only make 10.

Though human noses have an impressive 5 million olfactory cells with which to smell, sheepdogs have 220 million, enabling them to smell 44 times better than man. So dogs really DO smell!

Contrary to popular belief, dogs do not sweat by drooling. They sweat through the pads of their feet.

Expressing recognition rather than love, Utah prairie dogs exchange "kisses." By the touching of incisor teeth, they quickly confirm the identity of group members.

In Russia, dogs have been trained to sniff out ore deposits that contain iron sulfides.

The calories burned daily by the sled dogs running in Alaska's annual Iditarod race average 10,000. The 1,149-mile race commemorates the 1925 "Race for Life" when 20 volunteer mushers relayed medicine from Anchorage to Nome to battle a children's diphtheria epidemic.