See what scientists believe about humans' artificial selection pressures on the dog ... In fact, the variation among breeds of dogs is far greater than the variation among other completely ...

The study found that dog breeds with larger relative brain ... They are a function of artificial selection... a very directed selection, evolution under human hands," Balcarcel said.

From Pekingese to St. Bernard and greyhound, dogs come in such startling variety it's easy to forget they belong to the same species. The profusion of breeds today -- at least 150 -- reflects ...

In 1873, only 40 dog breeds and varieties were known; now, there are about 450 recognized breeds worldwide. Humans ...

Five very different breeds of dog. Pedigree dogs come in lots of different ... Keep repeating the process of selection and breeding until you produce a breed that consistently produces a lot ...

A dog breeder explains selective breeding, looking at puppies that have useful and less useful traits. Michaela explains how artificial selection is also used in vegetables, showing how broccoli ...