The shrill of it all
An issue that causes novice trainers sleepless nights is teaching the stop or sit whistle. Get it right and you will have a high degree of control over even the hardest to manage dog. Get it wrong and the wheels can come off very quickly, which may not only cause momentary embarrassment but could result in you not being asked back to a shoot.
The stop whistle is the brake on your dog and when you use that single sharp blast the dog needs to respond immediately. It needs to stop running or hunting and preferably spin round to look at you the handler, ready to respond to the next command. It can seem a complicated process but like so many aspects of gundog training, if you lay down your foundations
