Australian Dingo Fence

Have you ever heard about Australian Dingo Fence? I haven't. But it is one of longest fences in the world. And the longest dog fence anywhere. It is almost 3500 miles (5614 km) long. And it was built to keep wild dogs away from humans. Are those dogs really so dangerous, that people had to built those fences? Actually, there was another famous fence in Australia - Rabbit-proof fence.