Cats are creatures of habit and will normally use the box once trained. If, however, your cat learns to associate a bad experience with the box, she may stop using it. The problem, contrary to popular belief, may be a physical one that she just can't control.

Here are four good reasons your cat won't use the box.

1. Painful Urination - any medical condition that causes a cat pain while urinating will create a bad association. Since your cat can't hold it forever, she's going to urinate somewhere other than the box at some point. Often, once cats go in a spot, they will return to that spot until you completely remove the odor and/or retrain the cat.

2. Pain During Bowel Movements - if, for example, your cat is painfully constipated she will associate pain with the litter box. When she is finally able to go, it may be on the kitchen floor, instead of in the box.

3. Painful Joints and Muscles - if your cat can't get in and out of the litter box without experiencing pain, she won't want to use it. If there is anything causing her pain while squatting, or getting in and out of the box, it could mean trouble. Injuries, arthritis, or some other painful joint condition could create a cat litter box problem.

4. Limited Range of Motion - it's possible that your cat may not be able to climb up into the litter box. If you have an older cat, or injury or disease has limited her movement, she won't be able to use the box.

Many readers believe that litter box problems are always behavioral. I hope this article has shed some light on other possibilities. If your cat is having a physical problem that you are unaware of, your vet can help sort that out.

Once you determine the source of the problem is pain, then your vet can come up with a treatment plan. The treatments will vary for depending upon the underlying cause. Some retraining for your cat will probably be required. Just make sure to exercise a lot of patience while your cat readjusts.

If a mobility problem is at fault, there may be some things you can do to help. Make it easy on your cat by getting a low litter box so your cat doesn't have to step too high into it. Also, a large box that is easy to move around in would be better. Depending upon your situation, your vet may have a treatment to help your cat's mobility problem.

Remember, a cat litter box problem that has a physical cause is usually fixable, once the cause is identified by your vet. Anything that causes your cat to associate an unpleasant experience with the box needs to be addressed right away. If you catch these problems early on, they are much easier to handle.