Here's a video of my friend Melissa and her Heeler "No Worries Jake"
She's been working with Jake now for a couple years in agility.
You can see they still have a ways to go - but not too bad.
BTW....he's not suppose to stand there and bark like that - it's a timed event. She says he does it because of his personality..ha ha.
BTW - she's one of the ladies in the Carolinas who run a rescue organization for ACD's. They've helped save a bunch of Heelers over the years!