Keep your pet safe and secure at all times, especially when you're not around. This Replacement Kennel Door is specifically designed for use with the Petco Classic Small Animal Kennel in sizes small 100 (19" x 12.5" x 10") and intermediate 300 (24" x 16.3" x 14.8"). To ensure a proper fit, be sure to match your pet's kennel door dimensions with the appropriate dimensions of the replacement door.