How do you train a dog to return to sight while running a blind. I know if you sit a dog that has just disapeared over a dike to give a quick come in whistle and then sit them on the dike and then cast them. How do you train them to move so they can see you when they have been lost from sight due to cover on one side of a blind? As an example running tight to a point of tules and your dog carries the line past the point for a 100 yards (open water) and just as you blow the whistle the dog turns and goes out of sight. Calling back the dog at this point might result in the dog swimming back 100 yards to the point before you see them again. Some dogs I have seen will automatically move to the side till they can see the handler when the sit whistle is given and they are out of sight of the handler. How is this trained?