we have ours trained so when we blow the whistle 2 times they will stop and look at us to see which direction we have turned then they turn with us. this works very good if they are not on a bunny. this takes alot of cut up hotdogs for a reward when they turn. we start this when they are young before they get too brave. this is when they are little and they want to follow you everywhere. becareful in the summer you can over heat the dogs make them come in for water or run them to near by stream they will jump right in. in the summer when we are training we use a 5 or 6 whistle sound when the bunny has turned back and ran past us. this gets the dogs excited and when they return you can put them a very fresh scent. after a while they learn that this gets them closer to the rabbit and they will come back most everytime. this also works great when you are ready to quit or load up. they think you have seen a rabbit and they come running. this only works with lots of practice. our dogs get more time running in 6 months than most dogs get in a life time. i hope this helps and gives you some ideas. i am finding out this is harder to explain than i thought it would be. alot of this stuff is easy to show you but hard to explain. we will try to help when we can. good luck