The best adjustable pet collar .Our PenSeepet dog collar is designed for everyday wear which provides comfort during your daily walks. Perfect for dogs of all shapes, breed, and sizes. Sizes: XS: 5/8 x 8-10.5" up to 18 lb,S: 5/8 x 10.5.-16" up to 25 lb, M: 3/4 x 14-20.5" up to 55 lb, L: 1 x 17.5-27" up to 92 lb. Design Features:High quality nylon webbing，strong high quality nylon,which is comfortable and breathable, strong and sturdy, higher tensile strength than polyester Strong plastic buckles are made of eco-friendly plastic, high tensile force Heavy duty zinc alloy D-rings for pets with anti-rusty treatment coating Unique herringbone sewing machine, beautiful and durable, special and stylish. [ Color and Size ] Dog collar that comes in 9 colors and 4 sizes,choose the most appropriate color collocation,make your dog look more cute and energetic.adjustable loop can easily adjust the size.Please take measurement of your dog's neck circumference