The Catahoula Leopard Dog is packed with surprises. It roared to popularity for its wild, marbled fur and piercing eyes, but this Louisiana native has a personality as bold as its appearance.

Dogs see differently than humans. The reason lies within the eye. In the eye are light receptors called cones and rods. Cones help us distinguish different colors, while rods help us see in dim light.

Ever wonder how your dog sees the world? Here's a look. Your pal's handsome eyes pick up on fewer colors than you do. A lot of things appear grayish brown to him. But he can also see yellows and ...