my mom has 2 queensland Heelers and have grown up with them I feel I can offer some advice.
You put him out side when he brks commands? if you do this he WILL think the back yard is punishment. Try teaching him a Quite command so that when he barks you can say quite and he'll stop. =our 2 heelers don't bark orders, and only bark when they hear someone is home. How long do you plan on being gone? do you have any friends that could check on him? if your backyard is safe and he can't escape leave some water, food and some treats if you leave for the day see if someone can check on him. If you don't feel safe doing it, Board him. I have 2 dogs and when we go for the day we have someone check on them if it's a long period of time, if it's just like a work day they are both kenneld in the house becuase we dont' have a secure backyard. I've boarded my golden before, but only when going out of town for a few days and didn't have anyone to watch her. she loved it. I've never boarded my Aussie pup as I've never gone anywhere long enough to have to have him boarded. hope that this helps a little bit..