Patent ID: 8881680

Claim:
A litter box and sifting system, comprising: a litter box enclosure having a front wall with an opening, a back wall, and a first tray support; a mounting system for mounting said litter box enclosure on the exterior of a building; a cat door assembly having a door for an entrance, a stationary tunnel section having an interior mounting frame for connecting to the interior of a building and extending from the door, an exterior mounting frame surrounding said stationary tunnel section for connecting to the exterior of a building, and an adjustable tunnel section connecting said stationary tunnel section to said opening, wherein said cat door assembly is for enabling a pet to pass from the interior of a building into said litter box enclosure; a first tray assembly for holding cat litter and mounted on said first tray support; and, a fan attached to said litter box enclosure for evacuating odors from said litter box.