Big Dogs Little Dogs (1998)

Man's best friend comes in all shapes and sizes, from teacup poodles to mountainous mastiffs. This entertaining look at domesticated canines follows the history of the relationship between humans and dogs, traces the origins of the most popular breeds from big to small, features training tips from doggie experts, digs into the reasons behind Fido's more peculiar habits and sniffs out the huge profits behind the billion-dollar dog industry.