Size of pet pearl collar: size S,8.5 inches +2 inches extension chain, which is usually suitable for 7 ~ 8.5 inches of pet neck; M-size,9.8-inch +2-inch extension chain, which is usually suitable for 9-11.5-inch pet necks, and L-size,11.8-inch +2-inch extension chain,which is usually suitable for 11-13.5-inch pet necks,Please carefully measure your pet's size before buying. Please carefully measure the size of the pet before buying. If the pearl is not long enough, you can buckle the pearl collar on the extension chain. Pet pearl collar, perfect for weekend party dress, is also an ideal gift for special occasions and festivals.