The name says it all with PetSafe's Big Cat Door! This cat door is generously sized for larger cats or even small dogs up to 25 pounds. This cat door offers the same convenient access settings as PetSafe's 4-Way Locking Cat Door: open, locked, in-only (allows your cat to come in but not go out) and out-only (allows your cat to go out but not come in). With its slim profile, this cat door gives you the flexibility to install in any door, including sliding glass doors and even sliding windows. A magnetic closure and weather stripping around the flap helps form a weather-resistant seal. Available in white.
Outer frame dimensions: 11.375"" x 11.375""
Flap opening: 7.125"" x 7.9375""
Cutout size: 9"" x 9.25"" for non-glass doors or 10.375"" diameter circle for glass doors