Complete source list – Top 10 Smallest Dog Breeds In The World
http://en.wikipedia.org/wiki/Toy_dog
http://www.akc.org/press_center/smallest-dog-breeds/
https://www.akc.org/breeds/toy_group.cfm
http://www.allsmalldogbreeds.com/small-dog-breeds-a-to-z.html
http://www.dogbreedslist.info/small-dog-breeds/#.VF8kccKIBH0
http://www.justdogbreeds.com/small-dog-breeds.htmlhttp://www.animalplanet.com/breed-selector/dog-breeds/small-dog-breeds.html
https://www.aspca.org/pet-care/virtual-pet-behaviorist/dog-behavior/living-small-dogs
http://www.petcarerx.com/article/what-are-some-teacup-breeds-of-dogs/1252
