Welcome to our store [Size] Please measure your dog's nose with a tape measure before placing an order, then choose the correct size according to the reference size. Size M, front mouth length 22cm, dog mouth length 6.5cm, back mouth length 28cm; Neck circumference length 40 - 47 cm (adjustable); Size L: front mouth length 25cm, dog mouth length 8.5cm, rear mouth length 30cm; Neck Length 46 - 53cm (Adjustable) Size XL: Front Mouth Length 29cm, Dog Mouth Length 9.5cm, Back Mouth Length 34cm; Neck length 46 - 53 cm (adjustable) as it is measured by hand, please understand if there is a slight error. [comfortable and adjustable] 4 adjustable leashes which adapt to the dog's mouth for more comfort, the leash can be redesigned to adapt to the size of the dog. [high quality material] This is a port metal basket rack, made of high quality metal, strong and durable, never rust, thin breathable leather, both comfortable and strong. [simple and stylish] It's not just a fashion , but also a legal requirement for dogs to wear such accessories. Let your little four-legged friend not be afraid of others, choose this elegant and beautiful base.