What Makes a Dog?

Analyzing dog DNA is helping to explain the origin, behavior, and diseases of dogs.

By Emily Sohn, 00:00 AM April 27, 2004

Dogs are like ice cream flavors: There's one to satisfy nearly every taste.

Choose a size, say. A St. Bernard can weigh 100 times more than a Chihuahua. Or pick the type of coat. Poodles have long, curly hair; pugs have smooth, short coats. Or select just about any other quality. Greyhounds are lean and fast. Pit bulls are stocky and powerful. Some dogs are dumb. Others are deadly. Some protect you from burglars. Others rip your couch to shreds.

A golden retriever takes it easy.

A golden retriever takes it easy. Eric Roell

Two d...

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