The origins of the Australian Cattle Dog is at the centre of great debate, so Don Burke visits breeders and owners to find out more about this intelligent, energetic and fiercely loyal breed. australian Australian Gardening show Bourke's Backyard breeders Burke's Backyard cattle cattledog dog Don Burke intelligent INU lifestyle show Loyal origins owners pets roadtest オーストラリアン・キャトル・ドッグ