Sit your dog at heel. Throw one dummy out in front to the left and another out to the front and right. Then send your dog for one. Line yourself and your dog up correctly; look at your feet position. Make sure you are lined up for the dummy. Send the dog. Once the retrieve is delivered, line yourself and the dog up for the second retrieve and send. If your dog doesn't go straight out to the dummy you have sent them for then call your dog back in, walk closer to the dummy and resend. The idea of this exercise is for the dog to take direction and go straight to the retrieve, they shouldn't hunt for it. So if it isn't happening go back a stage and reproof.