A marker is a tool that allows us to tell the dog exactly what behavior is being positively reinforced and it allows us to do so in a clear, objective and simple way. In other words, a marker turns out to be a tool that facilitates communication between the owner/trainer and the dog. When we correctly use a marker to train our dogs, we speed up the whole process by making it faster and more efficient; it also prevents the dog from developing frustration during the training session for not to being able to understand what we want from him and what behaviors are being reinforced. How do we use a marker, then? 1st Rule – We should mark the behavior at the exact moment it occurs. That is, if we want to teach a “Sit”, we should mark the exact moment the dog’s hind legs touch the ground; if...