Selective Breeding
This Chihuahua mix and Great Dane show the wide range of dog breed sizes created using artificial selection, or selective breeding.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Big and little dog 1."
http://en.wikipedia.org/wiki/File:Big_and_little_dog_1.jpg
Wikipedia
CC BY-SA.
