We currently have two mini Aussies, Sky and Sierra. They travel great. We got our first regular sized Aussie when I was on patrol back in the working days, and came across a lost Aussie, along with a German Shepherd. I opened the rear door of my cruiser and they jumped in. Dropped them off at animal control, went home after shift and told the wife about the Aussie. By this time I've had a few German Shepherds over the years as a canine officer, and still had one at home that was retired.
We went to animal control to take a second look at her, and my wife fell in love. No one claimed her, so we adopted her and ever since then she never left my wife's side, unless I took her out to play ball...which she loved to do. Sadie is no longer with us, but we have stuck with the breed. We went to the mini's, as I've always had large dogs, and learned that the smaller ones are easier to travel with. Very good dogs!