The "Pet Buckle Collar and Leash" is suitable for medium sized dogs. The light gold metal buckle is very stable and not easy to be bitten by dogs. There is an adjustment button on the ring to adjust the width of the dog's neck. The leash is adjustable in two lengths for a total length of 1.3 meters. You can wear a D buckle to shorten the belt in half.　The leash can be adjusted in two lengths, with a total length of 1.5 meters. You can put on the D buckle to shorten the leash by half.