Your dog should wear a leash during your SpotOn Training sessions until instructed to remove the leash when following our training program, and you feel your dog is ready to be off leash. You know your dog best and should use appropriate judgement in determining if your dog is ready to be off leash. Like humans, all dogs learn at different rates and it is okay to repeat training sessions until you are comfortable with your dog's understanding of the SpotOn Virtual Fence system. The leash should be attached to your pup's regular collar; not to the SpotOn collar as that can cause excess pressure on your pup's neck and damage the SpotOn collar.