Litter-Robot by Whisker: Making life with your pet endlessly better. Litter-Robot 4 eliminates the chore of scooping, reduces litter tracking, and traps odors. After your cat exits, Litter-Robot starts its cleaning cycle. As the globe quietly rotates, Litter-Robot's patented sifting process and design separates the dirty clumps from the clean litter, which are deposited into a large-capacity, tightly sealed waste drawer below.