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They have been bred over time to be that way. Although they are named for a city in Mexico, they are believed to have originated in China where it was once fashionable to breed dwarf sized plants and animals

EDIT: I've just read this article: http://www.livescience.com/7268-study-reveals-dogs-small.html

so basically, there's a gene/ genetic sequence in dog's brains near a gland that is like (or is) the pituitary gland. One or more mutations suppresses it, not producing as much of the hormone that makes you grow; preventing Labrador-sized Chihuahuas! (Rottweilers also have this, but other genetic factors likely make them large) Please read the article, it covers it better than I do.

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13y ago

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