Lucky Dog Collar and Leash set is perfect for St. Patrick’s Day but also if your pup’s name is Lucky! We consider this type of collar a house collar and recommend using a martingale collar for taking walks since a pup could potentially slip out of this type of collar. We do have this desing in the martingale style.  Martingale collars are an alternative method to house collars, choke collars, and harnesses. They are safer collars to walk your dog as it prevents choking and escapes and are easier to put on then a harness.  We chose to use metal hardware and a buckle closure on this collar for added durability. Your furbaby's safety is our top priority!  Please measure your pup's head and neck for proper fit.Small          10.5-14 inches Medium      12-17 inches Large          15-21 inches Measure your dog for best fit. It is adjustable.  Now, your dog can feel like an Alpha while you're still in control!