How they have changed over the years, to turn into the characteristic little dogs we know today. (thehappypuppysite.com)
English immigrants brought the resulting breed to the United States; the result is the strong, courageous, gentle dogs known today as American pit bulls. (dogcare.dailypuppy.com)
It is thought that such dogs as the Schipperke, Keeshond, American Eskimo and German Spitz may have been used in breeding programs to obtain the smaller dogs we know today. (petpremium.com)