cat that doesn't use the little box consistently  

I suppose if you cant solve why, you could put plastic down that protrudes around the litter boxes and paper and then the box so that there is a water proof easily cleaned up area round each one.

Have you tried different litter? Cats can be finiky about that stuff. Perhaps you can try something different in at least one of the boxes.

Do all three cats use all three boxes? Maybe this cat does not like to share. If she smells the urine of the other cats, she may not want to use the same box. Maybe keep one for her and only her.

Does she poop outside the box or just pee? If it's only pee, then perhaps she is trying to mark her territory. Letting the other cats know, hey this is my box.

Maybe the box is too small for her. I'm only guessing here as I don't know the size of your cat or the box. But could it be that she squats in the box only to have her hind side sticking out? Or does she just squat next to the box to pee?

I hope some of this helps.

Ours did it because she had diarrhea.. Have you changed the litter you use? Maybe she doesnt like it. Have you talked to the vet recently? I wish I knew what to tell you but everything you've did would be what I suggest.

My Waffles is like that. Ever since I bought my Columbus cat home from the shelter, Waffles seemed to resent him and left a daily, smelly "present" on my sunporch floor. I cleaned the mess immediately and since the floor is old and needs to be replaced, dumped a few drops of Chlorox on the soiled area.

Anyway, I read somewhere that once that resentment ends, the cat will continue to use the litterbox. I bought another litterbox and placed it in the sunporch. Both cats use it. Recently, I've noticed that Waffles craps in it, but only if she's the first one to use it. I line each litterbox with newspapers and change them often, which is after a cat craps in them.

It could be so many things. One is territorial. Yes, female cats do spray to mark territories if there are other cats. I had this, and that is what the vet told me. Or, it can be that she does not like the litter. They are fussy. You keep it clean, so that isn't it. Last, they can develope these habits, and it is hard to stop. It can come from fear, a move, or a change in the house hold. I hope you can get this solved somehow. I had a cat for 12 years that ran downstairs to the litter box, scratch in it, ran up stares peed on the carpet, and then ran downstairs and burried the clean sand. I have a male cat now, he poops and then scratches the wall and leaves it out in the open. Then the little girl cat goes in to cover his poop. They are strange creatures. Ya have to accept and love them as is. Use vinegar to remove the smell to stop her from that area of making.

Maybe try switching to a different litter, she may not like the texture or smell of the litter. Another possibility, one of the other cats may have used it, and she doesn't like to use it after it's been used by one of the other cats. Or, if it's one of those hooded ones, try removing the hood. If not, try putting one of those hoods on it. Or, you say it's clean, but maybe it's just not "clean" to her standard. Cats are so weird, hard to figure them out sometimes...

If she is like my cats, she is just doing it to get a reaction from you.

Hi kelly3. I used to live with 0 cats at one time and managing the cat's toilet was one hard job! The thing that I found about my cats was similar to yours that is they would only use the litter box if it was clean.

I also found out that the way to teach those kitties are to catch them red handed. Once caught, they must be punished on the spot and due to that they would remember not to repeat the same bad behavior. Hope that helps :)

the owner of the cat has that to educate when still is ismall

I know you said that the boxes are clean, but have you considered a self-cleaning box? I know they are a bit pricey but it may be worth the investment. Or maybe she is just having a kitty emotional crisis and this is her way of getting your attention. If she;s the type of cat that likes to cuddletry holing her more? Good luck!