Standard Dog Collar ——— Our dog collars are fully adjustable. They are made of machine washable cotton fabric with a nylon core except for small collars. Small collars are made of machine washable cotton fabric with an interfacing core. Interfacing is a fabric stabilizer that gives the collar stability and form. Collars feature a nickel plated d-ring, plastic triglide and a plastic side release buckle. Each collar is handmade to order. Sizing ——— Collar lengths with available buckle widths. Buckle width indicates the width of the collar. Please refer to chart below: Small 7-10” (Available Buckle Size - 5/8”) Medium 9-14” (Available Buckle Sizes - 3/4” & 1”) Large 13-18” (Available Buckle Sizes - 1” & 1.