Black & White Checkered Speedway Dog Harness Bold & Beautiful, this striking harness is machine washable, looks & wears great. Premium webbing, hardware that won’t rust or corrode. While your dog is standing, measure your dog’s girth, completely around his or her ribcage and over the back. Take your measurement an inch or more behind the front legs. How far behind the legs you measure depends on the size of the dog. For a Jack Russell an inch would be fine, for a Greyhound you would measure three or four inches behind the front leg. This girth measurement will correspond directly to the size of the harness. If the measurement is larger than the stated harness size your dog will need the next size larger. For example if your dog has a 10 1/2 girth, the correct fit will be a 12″ harness. If the dog measures 14 3/4″ the 16″ harness will be the correct size. Matching Speedway leashes & collars also available”