Maddie the Catahoula Heeler as a puppy at 4 months old—"This is her first time riding in the car and this is how she felt she should do it!"
The Catahoula Heeler is not a purebred dog. It is a cross between the Catahoula Leopard Dog and the Blue or Red Heeler, also called the Australian Cattle Dog. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.
(Note: the Blue Heeler is also called Australian Heeler, Hall's Heeler, Queensland Heeler, Australian Cattle Dog, Australian Cattledog and Australischer Treibhund.)