The first thing to do is get your dog to associate a hand gesture with one of your command words; see below for tips on how you can link a specific motion to a specific command. From there, getting your dog to react to the hand signal alone is a matter of repetition.

• While still using the food reward, gradually eliminate the verbal command. For a while you might use the verbal command and hand gesture together half the time and the hand gesture alone half the time.
• Once your dog reliably reacts to the silent hand gesture when you have the food, gradually remove the piece of food from the equation. Soon your dog will sit, lie down or come with just a motion of your hand.

Sit
Start with your dog standing in front of you. Hold a piece of kibble in your fingers and, starting with your hand at your side, bring it up slowly, folding your arm as if you were going to toss something over the same shoulder. Do this slowly, bringing the kibble past your dog’s nose. Say “Sit” at the same time. You’re leading his nose upward as you say sit. When he does, praise and give him the kibble.

Down
Start with your dog sitting in front of you. Hold a piece of kibble in your fingers and, with your hand raised above your head, bring it down, keeping your arm straight until it is hanging at your side. Do this slowly, bringing the kibble past your dog’s nose as you signal. Say “Down” at the same time. You’re leading his nose down as you say down. When he downs, praise and give him the kibble.

Come
Start with your dog in front of you. Hold a piece of kibble in your fingers. Start with your arm held straight out to your side parallel with the ground. Now sweep your arm forward so your hand touches your opposite shoulder. Do this slowly at first, bringing the kibble past your dog’s nose as you signal. Say “Come” and back up a few steps at the same time. When he does, praise and give him the kibble.