I have used the sense-sation harness with good luck. It is not the magic cure all for pulling, but really nothing is. It helps so that the dog is not being choked by pulling and uses gentle pressure in the shoulder area. It can be ordered only online and was one of the products of the year award by Whole Dog Journal. I can highly recommend it, as we have also had several of our dog clients use it also. I don't like the GL for many reasons. Another reason is that people think it is a muzzle and it is uncomfortable for the dog.
Nano
Nano