51.   Suddenly, there are books under the litter box, books under the bed, books rising in towers.

52.   Tend litter boxes.

53.   The cat refuses to use the litter box.

54.   The companies say a dog should begin using a litter box within two weeks, although complete training can take up to two months.

55.   The litter box could have ruined me.

56.   The most likely way to get this disease is through handling cat litter boxes.

57.   The odor-free cat litter box is a myth as elusive as Bigfoot and much more fervently sought.

58.   The pig takes care of her business in a litter box, he said, and only eats about a pound of feed a day.

59.   The one place she was not going to return to was her litter box.

60.   The semi-weekly total change of two separate litter boxes could be an Olympic event.