We ordered the Don Sullivan (He is from our home town, Victoria, B.C. Canada, some of the sites where the tape was filmed are the same parks where we go.) tape and command collar for our 150 lb. Malamute/Shepherd cross. The training methods are good but the collar broke the first time our dog pulled. The metal ring does not hold under the weight of this big dog. We then bought the pinch collar at the local pet shop. This collar is recommended for large breeds and is mentioned in the Don Sullivan tape. It is recommended for owners that are small or disabled but I (5') and have arthritis in my hands can not put enough pressure on the prongs to put it on the dog. My husband has used it and has gotten great results. I only take the dog to off leash parks.