cat pooing outside his back

Question
I have 7 year old male american bob tail that is skittish. I have had him since he was a kitten. It started about 5 years ago. He started pooing outside his box every now and then. He was raised with a male Siamese that has passed away about 1 year ago. I had thought he was being jealous of the other cat, so I got 2 boxes. this did not help. I clean the box every day and every couple months clean it with bleach. i have tried putting his poo inside the box so he knows thats where it goes. there is no rhyme nor reason to this other wise he is a fat healthy boy.

Answer
Teri,

5 years is a long time to wait to try to correct a behavior problem.

You can try a bigger box with deeper litter. You can try moving the litter box to a more private area. Or try putting a puppy pee-pad next to the litterbox. Some cats don't like the feel of litter under their feet.

It may also be a medical issue. If the cat has pain when he uses the litterbox he will go elsewhere because he will associate that pain with the litterbox.

That should give you some directions to go, plus I am including some  links to good articles about improper elimination that you may  find helpful: (copy and paste or type the whole links into your address bar)

http://cats.about.com/cs/behavioralissues/a/outsidebox_two.htm

http://www.geocities.com/heartland/pointe/9352/litterboxhelp.html

http://www.apbc.org.uk/article10.htm

Tabbi