A litter box, sometimes called a sandbox, litter tray, litter pan, or catbox, is an indoor feces and urine disposal box for cats (as well as rabbits, ferrets, small dogs such as Beagles and Chihuahuas, and other pets that naturally or through training will make use of such a repository) that are permitted free roam of a home but who cannot or do not always go outside to relieve themselves. Many owners of these animals prefer not to let them roam outside for fear that they might succumb to the elements or get hit by a car (Tufts Veterinary School, among others, report indoor cats live, on average, ten years longer than outdoor cats). A litter box makes it possible to shelter pets from these risks.
In the wild, cats naturally excrete in soft or sandy soil for easy burial. To stimulate this instinctive desire, a litter box's bottom is filled typically with an inch (2.5 cm) or more of cat litter. Litter box filler is a loose, granular material that absorbs moisture and odors such as ammonia. Some litter brands contain baking soda to absorb such odors. The litter material also satisfies a cat's instinctive desire to use an easily-dug material. The most common material is clay, although recycled paper "pellets" and silica-based "crystal" variants are also used. Sometimes, when an owner wishes to stimulate the cat's natural instincts, natural dirt is used.
Read more about Litter Box: Types of Litter Boxes
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