Wilderdog Ultralight Dog Collar, Marina Leash Size:Small: 11 in to 15 in Weight of Dog Less Active 778810881118 Weight of Dog Less Active (Grams or Cups) Active (Grams or Cups) 60–80 lb 230–288g or 2 – 2½ C 345–431g or 3 – 3¾ C 80–100 lb 288–345g or 2½ – 3 C 431–518g or 3¾ – 4½ C 100–120 lb 345–383g or 3 – 3⅓ C 518–575g or 4½ – 5 C 120–140 lb 383–431g or 3⅓ – 3¾ C 575–661g or 5 – 5¾ C 140–160 lb 431–489g or 3¾ – 4¼ C 661–728g or 5¾ – 6⅓ C 160–180 lb 489–536g or 4¼ – 4⅔ C 728–776g or 6⅓ – 6¾ C Weruva never fails to let you know that none of the chicken come with added antibiotics and hormones for your healthy pup Want super light gear that's still burly as heck If your pup is between sizes