We ran Shooter Flurry and Rev first. Sherpa felt a little self conscious to pull next to his brother, he laid down with a sad face when we hooked him up at first. But then when the dogs started running, he was screaming and bouncing around on his leash-"I changed my mind Dad! I changed my mind!" So we switched Flurry to the back with Rev and put Sherpa up in front with Shooter. They did so well!!