There are quite a few working dogs at the ACT pound at the moment. Young dogs, who no doubt are high energy and in need of decent training.
Because they are working dogs, they are clever. And have no outlet for all that smarts, so they amuse themselves. What they find 'fun' is of course not so entertaining for idiots who bought a 'cute little puppy' forgetting that these dogs grow up, and need a lot of input by way of training and exercise to make great dogs.
I've had kelpies and Kelpie crosses through my classes, and it doesn't take that much effort to turn a rascal into a brilliant dog. They are easily trained - they just want to work for you (and love clicker training).