1. Take your cat to the vet. This is the most important step, as it will help rule out any medical problems that could be causing the behavior. Your vet will be able to perform a physical exam, check your cat's urine, and recommend any necessary treatment.
2. Clean the litter box thoroughly. This means removing all of the old litter, washing the litter box with soap and water, and rinsing it well. You may also want to add a new layer of litter to make it more appealing to your cat.
3. Make sure the litter box is in a quiet, private location. Cats don't like to use the litter box if they feel stressed or disturbed. Choose a spot that is out of the way of foot traffic and away from other pets.
4. Try different types of litter. Some cats prefer clumping litter, while others prefer non-clumping litter. You may need to experiment to find the type of litter that your cat likes best.
5. Make sure the litter box is the right size. The litter box should be large enough for your cat to turn around comfortably. It should also be deep enough to hold at least 2 inches of litter.
6. If your cat is still scooting his butt on the floor and urinating outside the litter box, talk to your vet about other possible solutions. There may be a behavior modification technique or medication that can help.