Why are some dogs so small and some so large?

Dogs come in so many different sizes, from the tiniest teacup terrier to the giant Great Dane. How did we get such a delightful assortment of these furry best buddies? We asked Brains On producer and archaeologist Anna Goldfield to help us find the answer. Got a question that’s been hounding you? Send it to us at BrainsOn.org/contact, and we’ll make sure to bark up the right tree!