IRIS Oval Top Entry Cat Litter Box vs IRIS USA Top Entry Cat Litter Pan

Both are IRIS top-entry boxes with the same 4.5-star owner rating, so the choice comes down to size and what's in the box. The Large Pan is the bigger, deeper box with a wider 9.25-inch entry, which suits large cats and heavy diggers. The Oval is the compact version with privacy walls and two scoops included. Owners of both praise the top entry for keeping dogs out and cutting litter scatter; the main complaints are that the lid holes don't catch everything and that older or arthritic cats may balk at jumping in.

• Choose the IRIS Oval if you have an average-size cat, want the litter-catching lid with privacy walls, and want scoops included in the box.
• Choose the IRIS Large Top Entry Pan if you have a big or long cat, need more floor space inside, and want the widest entry hole.