Keys is the creator of the family unifying Keys Method to Gentle Training, a blend of positive reinforcement and Keys' own unique Gentle Training techniques. He rejects all aggression-based forms of dog training.

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The first pillar of the Keys Method, is for both dog and human to maintain a state of calm and relaxation. The second pillar is the unification of the family in changing their own behaviors. The use of aggression, creating attack dogs, and harmful training tools (shock collars, prong collars, choke collars), are never permitted in The Keys Method.