The goal of ressuscitation
To activate the breathing and the heart beat. This will prevent, due to lack of oxygen, damage to the brain.
There is only one purpose to the resuscitation: To keep your dog alive until the arrival of a veterinarian.
Before beginning the resuscitation:
First control the chest. If there is no movement, verify by putting your hand on the dogs chest. This way, the breathing and the heart beats could be felt.