Put a leash on the dog and put the dog's food bowl in front of the dog. Dogs are not allowed to eat when they see food. If necessary, you can tighten the pulling belt to stop it and command it to "let it down" in your mouth. Let it sit down, at least stand beside you obediently.
Wait until the dog begs you to let it eat with his pitiful eyes. Remember to be patient, it doesn't matter if you wait a little longer, until it will eventually look at you to see if you are ready to agree to let it have a meal.
When he does this, you can order it to "eat" and allow it to start a big meal. Remember to praise it for patience.
While it is eating, you can reach out and add a little delicious food to its bowl, so it will understand that others reach out to his bowl, not to steal its food on the plate.