A small camera on Mrok's collar gave me the answer, and it turned out to be far more interesting than I expected: a window onto how a dog's brain decides, second by second, which sense gets priority.

I'm describing a few traits that show up in the Australian Cattle Dog in a form that is either unusual or simply more pronounced than in most dogs.

Does a physically intense walk with lots of play – tiring the dog out – bring them to low arousal? Absolutely not - it actually pushes them even higher.