Sometimes known as a Blue Heeler or Australian Heeler, the Australian Cattle Dog
is a medium-sized dog with serious endurance. Originally made up of several breeds, including the Collie, Dingo, Bull Terrier, Dalmatian, and Black and Tan Kelpie, he has a reputation for being stubborn and having energy to spare — not to mention a truly adventurous spirit and belief in his own invincibility that will leave you wondering how he’ll injure himself next.
(Ron Willbie, Animal Photography) More from VetStreet.com
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