Traditional harnesses can actually encourage dogs to pull harder because of the “opposition reflex.” That’s the reflex that makes sled dogs do what they do. The Easy Walk Harness' unique front-chest leash attachment stops pulling by tightening slightly across your dog's chest and shoulder blades. The gentle pressure steers your dog to the side and redirecting his attention back towards you. The Easy Walk Harness never causes coughing, gagging, or choking because the chest strap rests low across the breastbone, not on the delicate tracheal area. Our exciting new ECO line features our top selling products, made with eco-friendly materials in mind. All products consist of webbing made of 100% recycled milk cartons and 100% recycled packaging. At last, great products that you can feel good about! Small 15"-20" Terrers, Shelties, Spaniels etc. Medium 20"-28" Border Collies, Retreivers etc. Large 26"-36" Shepherds, Rotties etc.