It helps that I'm a fan of blue heelers, the real Australian shepherd (though I also love the American breed called "Australian shepherd").
Technically breed through and through to be cattle dogs.
Big difference being shepherd dogs focus outwards and protect, sheep dogs work and move herds on command using eyballs and stalking body language, whereas cattle dogs are "heelers" they get in close and literally bite the heels of massive stubborn cattle that won't budge until nipped.
Heelers are great dogs IF you can live with their needs - they seriously live for three to four hours of hard exercise a day, flat out running, herding, chasing, interacting. If you can't do that then don't get a heeler, they're smart and you'll pay for it.
If you don't have a herd of cattle at least live 10 km from a beach and make them run after you while you bike, motorcycle, or drive slowly there.
Getting a throwing stick that'll travel the lebgth of a football field and|or a tennis ball launcher is a good way to keep them moving, they'll fetch at extreme range for good few hours.
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