How we speak to our dogs is just as important as what we tell them, especially when we are training them.
There are three main ways to verbally communicate with your dog.
A command verbal a correction and praise. When commanding the dog to perform an action sit down stay heel use a tone that carries authority but not threat, or request. You are telling the dog which action you would like performed and nothing else.
Your stance should also be authoritative stand up straight.
Your dog is not a machine and will not always readily perform the commands.
Do not allow frustration to enter your voice when giving a command.
If you feel yourself becoming frustrated take a break. Your dog can sense this and will start to associate training with your unhappiness.