This is the Island Floral Orange Martingale Dog Collar – Size Medium – 1 Inch Wide and fits neck sizes 14 to 20 inches from Yellow Dog Design, the martingale collar is perfect for dogs with necks that are larger than their head. Made right here in the USA and provides more control without a choking effect. SIZING: This dog collar is available with adjustable sizing built right into the unique loop design. Measure your dogs neck size or its current collar length (not including buckles) to obtain correct sizing. NOTE, Martingale dog collars are intended to fit loosely on the dogs neck. If you are shopping for designer, affordable dog accessories, then look no further. These durable, guaranteed to last dog products have no rough edges, no threads to fray or break, no problem going in the wash, and no stress getting them on or off your dogs.