Canicross: ka-nē ˈkrȯs: is the sport of cross country running with your dog. All you need is dog harness, bungee line, a waist belt and an eager 4 footed running companion. 
Buckleless design facilitates light weight ruggedness, easy on / off use
High quality welded hardware
Bright neon nylon webbing (Made in USA)
3M Scotchlite reflective material 8710 and 8912
 
Head-Lites Cani-Cross collars are available in the following sizes:
15-17 inches, 17-19 inches, 19-21 inches, 21-23 inches, 23-25 inches  

38-43 cm, 43-48 cm, 48-53 cm, 53-58 cm, 58-63 cm.