While many people consider a closed litter box a way of isolating odors by confining them to the box itself, its important to remember that as a rule, behaviorists do not recommend closed boxes for cats for a number of reasons. Primarily, in a multiple cat household, where there is feline rivalry and tension, a cat using a closed box may find itself ambushed and held hostage inside by other members of the feline household. From a practical standpoint, many of the boxes may look big but the actual interior pan area is way too small for big cats to turn around in comfortably. Also, sometimes the design makes the entry point too high for elderly cats to access easily. Take all these points into consideration when shopping for litter boxes for your own feline family members.