If your cat stops using the litter box, remove the cover; he may be wary of “predators” trapping him.
With multiple cats, vets recommend multiple litter boxes — one per cat, with another as a spare.
To fight cat fur, put clothes in the dryer for a few minutes before washing to loosen hair.
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SLIDE™ Easy Clean-Up Clumping Litter, Multi-Cat
Double Duty Clumping Cat Litter