For every pit bull, there were numerous other mixed breed dogs and cats in just as much need to be spayed or neutered. (snkc.net)
Eventually these and other mixed breeds led to the development of the Australian cattle dog. (dogcare.dailypuppy.com)
Some of the breeds on the transport included Shih tzu's, Pomeranians, Yorkies, Chihuahuas, English Bulldogs, Sharpeis, Pugs, Shiba - Inus, a Yellow Lab, and several other mixed breeds. (animalleague.org)