Hamilton Adjustable Dog Collar Fully adjustable from 16 to 22-inch for medium breeds All cuts are finished away from the neck to avoid irritation Hamilton builds in quality with only the highest quality nylon webbing, thread and hardware Stitched and box stitched ensuring durability When measuring pet's neck or chest to ensure proper and comfortable fit, add 2 inches. When measuring pet's neck or chest to ensure proper and comfortable fit, add 2 inches.