Published: January 2002
Learn More
In Learn More the National Geographic magazine team shares some of its best sources and other information to expand your knowledge of our featured subjects. Special thanks to the Research Division.

Related Links

International Wolf Center
This site gives information about wolves and their association with humans and other animals.

American Museum of Natural History
Visit the museum in New York City whose paleontology department collected some of the best specimens of early dog precursors, such as Borophagus.


Fogle, Bruce. The New Encyclopedia of the Dog. Dorling Kindersley, 2000.

Morey, Darcy F. “The Early Evolution of the Domestic Dog.” American Scientist (July/August 1994), 336-347.

Olsen, Stanley J. Origins of the Domestic Dog. University of Arizona Press, 1985.

Sheldon, Jennifer W. Wild Dogs: The Natural History of the Nondomestic Canidae. Academic Press, 1992.

Thurston, Mary Elizabeth. The Lost History of the Canine Race. Andrews and McMeel, 1996.

NGS Resources

Foster, Joanna. Dogs Working for People. National Geographic Books, 1972.

Linehan, Edward J. “Dogs Work for Man: Intelligent and Eager, Man’s Oldest Friend Learns New Ways to Catch Thieves, Find the Lost, and Master Other Tricky Tasks,” National Geographic (August 1958), 190-233.