this may not work with an arthritic cat,but my litter box is one of those rubbermaid storage boxes. it is almost 2 foot tall and 2 foot wide and 3 foot long. i set something beside the box they can use as a step,and they go right in. the reason for me doing this is my babies would sling the litter all over the place.they do bring some out that sticks to there feet,but not like before.