Kangaroo meat as dog food?!?

This morning, while travelling to office on a bus, I saw an advertisement on top of taxi. It read: Kangaroo & Apple. I cannot remember the brand, but it was a surprise for me. After googling about that I realized that it was quite common now, since kangaroo is also a source of meat in australia. When I was studying in Australia 10 years ago, they have just started promoting kangaroo and emu meat. I guess it is a natural progression from human food to pet food. It is funny looking back, it felt like cultural shock to me.