P-42, r. 10.1 - Regulation respecting the safety and welfare of cats and dogs

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21. Cats that are kept indoors must have access at all times to a litter box that
(1)  is made of a non-toxic material that can be washed and disinfected easily;
(2)  is in good condition, free of parts jutting out and sharp edges or other potential causes of injury; and
(3)  contains a sufficient amount of regularly-replaced absorbent litter, to avoid odours and the accumulation of feces and urine.
O.C. 1188-2011, s. 21.