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Litterbox Urine Shields with Velcro (3-pack) (Amazon)

These are GREAT for cats who have “elevator butt” or who stand up to urinate.  A lot of “high-sided” litterboxes aren’t tall enough to contain urine when cats stand to urinate, and these do the trick.  They have a Velcro strip along the bottom so they can be removed for cleaning, too.