Classic Pet Products No Jump Harness Fits All lets the problem jumpers train themselves. By restricting the flexing of the rear legs, the dog will work against the restraint and will find jumping uncomfortable. For dogs between 10 and 80 pounds. One size fits all.Over 5 ft long for adjustments. Nylon: 3/4 inch wide by 1.4mm thick. Sewn with a heavy duty box stitch at all points of strain. Three safety catches and four clips all rust proof, allow you to make a comfortable secure adjustment.Note: This harness should only be used under supervision as some dogs may chew the nylon straps or buckles.