Canine Equipment Ultimate 3/4-Inch Quick Release Martingale Dog Collar, Medium, Checker Board Great for training or dogs that like to back out of collars Quick release side buckle makes putting-on and taking-off quick and easy Gentle alternative to traditional choke collars Limited slip action to prevent over correcting and choking Size medium fits a neck size of 14-18 inches Great for training or dogs that like to back out of collars Quick release side buckle makes putting-on and taking-off quick and easy Gentle alternative to traditional choke collars Limited slip action to prevent over correcting and choking Size medium fits a neck size of 14-18-Inch