Australian shepherds are extremely intelligent. And you have to keep their brains occupied and challenged. Or they will use that brainpower to disrupt your life as much as possible.

After I was married, my wife and I wanted a low maintenance dog, so we got a Brussels Griffon. That dog could stare at a blank wall for three hours and be entertained. He was not bright. Took us forever to house train him but he didn't really enjoy playing like other dogs. He wanted to be petted. He'd bark when someone was at the door. That was the extent of his life. He snored like an idling chainsaw, though.