the puppies were being transported by an ohio mennonite family of six .
wendell steiner said he offered to bring the puppies to his wife 's family in pennsylvania because his father could no longer take care of them .
he said he was unaware it was illegal to transport animals on the roof a car .
the puppies were handed over to police , who let family go with a warning .
romney admitted to driving 12 hours with his dog in carrier on top of his car .