A Black dog trainer who attempts to recondition the aggressive white shepherd. He isolates the dog, uses protective gear, and becomes its sole caretaker to break its violent conditioning. Despite setbacks, he persists with the training. Ultimately, he is forced to shoot the dog to save Carruthers' life.
The vet's early intervention sets the stage for Keys' later behavioral work.
Keys works under Carruthers but ultimately acts independently to prevent further violence.
Julie hires Keys to professionally recondition the dog's violent behavior.
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