These shock collars might not be what you think. The Ecollars we use in training are blunt stimulation, similar to that of a tens unit that you would use at a physical Amazon.com : Educator ET 300 Zen Mini E Collar for Dog Training with Remote 1 2 Mile Range, Waterproof, 100 Blunt Stimulation Levels, Tone or Vibration Mode, Night Light Tracking for Small, Medium Amazon.com: Educator ME 300 Micro E Collar for Dog Training with Remote 1 3 Mile Range, Waterproof, 100 Blunt Stimulation Levels, Tone or Vibration Mode, Night Tracking Light for Small, Medium & Large Educator PG 300 Vibration Collar E Collar Technologies Amazon.com: E Collar ET 300 Mini Educator Remote Dog Training Collar 1 2 Mile Waterproof, Premium Finger Clicker Trainer, 100 Stimulation Levels + Vibration + Light + Sound 1 Dog Small to Medium, Yellow : Pet Supplies