Other likely symptoms include: 1  radiating pain in the face, jaw, or neck, 2  jaw muscle stiffness, 3  limited movement or locking of the jaw, 4  painful clicking, popping or grating in the jaw joint when opening or closing the mouth, 5  a change in the way the upper and lower teeth fit together.
Then you can train your dog to walk to heel, and prevent them getting the opportunity to pulling on the lead. Every time your dog gets to pull on the lead in the middle of your training program, they are getting a chance to perfect the pulling habit and reducing the effect of all your hard training work.
I have tried one and they are awesome! We had one in the gym at school. Your stride doesn't feel totally natural, but more natural than on a real treadmill. Best I can tell, is that the curve in the front and back help to keep the belt in motion after your foot-strike starts to propel the belt.