This handmade Martingale dog collar with optional flower or bow tie is made out of a red and white checkered cotton fabric. The slip on collar is available in a 3/4", 1 and 1.5 inches width. Each Martingale dog collar is sewn on black Polypro Webbing and finished off with a quality nickel metal d ring and metal triglide slides to adjust the size of the slip on collar. The matching Flower/Bow Tie are attached with double sided Velcro and can be placed anywhere on the martingale dog collar. *Measure the largest part of your dog's head, and the middle of his/her neck. *If your dog's head is larger than its neck, you will need a size that is large enough to slip comfortably over its head. *If your dogs neck is larger than his head, then you need a collar that will fit comfortably around its neck. Your dogs head size will not matter in this case (e.g., Greyhounds, Shelties, etc.) *The collar size you select should adjust large enough to fit over the head, and adjust small enough to fit comfortably around the neck. A martingale collar provides control over a dog without choking it. A martingale dog collar does not put pressure on the dog's neck and cause choking. Martingale collars work great with any breeds especially breeds whose necks are larger than their heads and they are more secure than buckle collars. Martingale dog Collar Sizes size S fits neck 12" - 15" size M fits neck 14" - 18" Size L fits Neck 17" - 24" Size XL fits Neck 20" - 29”