Research into cat litter preferences reveals that substrate type significantly affects litter box use and welfare, with most cats preferring unscented, fine-grained clumping litter in sufficient depth for natural burying behavior.
Inappropriate elimination - urinating or defecating outside the litter box - is one of the most common reasons cats are relinquished to shelters. In many cases, the problem has a litter box component: wrong substrate, too little depth, aversive scent, or insufficient boxes. Cats who cannot use their litter box comfortably may hold urine, increasing the risk of urinary tract disease. Understanding that cats have specific substrate preferences and that human preferences for scented, novel litters often conflict with feline preferences is essential welfare knowledge. Providing appropriate litter boxes is not merely a convenience issue - it prevents both behavioral problems and physical health complications.