SportDOG Fieldtrainer Stubborn Dog - 425XSDesigned for high drive, more stubborn dogs The compact FieldTrainer 425X is our smallest and lightest e collar built for in the field training or hunting with close working dogs. Consistency and perfect timing are critical to developing your sporting dog, so the remote is quickly and easily operated without having to look at it which lets you focus on your dog and not your equipment. With only a slight movement of the dial and the push of a button,