An extinct variety of zebra only had stripes on its head and neck.

The last Quagga died in a zoo in 1883. At the time no one realized that this actually meant the animal was extinct. Their wild population dwindled in their native South African grasslands with the introduction of non-native sheep and goats. Because they competed with the Quagga for grass to graze on, settlers hunted them to extinction.

The human nose can distinguish more than 10,000 different smells.

There are hundreds of different kinds of neurons in the nose that specialize in recognizing different odors and transmitting those signals to the brain. This occurs when molecules of the things that you can smell travel to your nose. Whatever thing you are smelling (a flower, a piece of fruit, an onion, etc.) gives off light, volatile chemicals called odorants that make their way to your nose as they evaporate. These chemicals trigger the neurons in your nose that allow you to recognize the smell. Specialized smell neurons exist to pick up on different kinds of smells, allowing us to distinguish between over 10,000 different odorants.

 
Source: How Stuff Works

Dogs do NOT see in black-and-white.

Yes, dogs are partially colorblind, but that does not mean they do not see any color at all! Man’s best friend suffers from a kind of colorblindness that is called deuteranopia in humans. Both people and dogs have three different varieties of color receptors in their eyes: one for red, one for green, and one for blue. Deuteranopes, and similarly all canines, do not have the green color receptor and therefore cannot tell the difference between shades of green and other colors!

Source: The Straight Dope