No Matter How Big or How Small...

The mysteries of life baffle us all. Every time one of these conundrums is solved, our existence takes on greater meaning. Recently, several leading scientists discovered why certain dogs are little and others are large. As it turns out, small dogs all bear regulatory DNA that shuts off the gene that produces powerful growth factors. The gene was most likely inherited from a miniature wolf between 12,000 and 15,000 years ago. This discovery helps explain why dogs display the greatest size differences among mammals. Now you know.