Hi,

Lots of water first (but not too much) (no soft drinks or milk) and some fiber afer a few days if the water alone does not do it. Just take your time, i assume your child is not feeling bad, any pain etc....

Try the product "Experience" from the link below. Make a tea and sip at night before bed. It is very powerfull so start out by using 1/4 of a pill in a tea for 4 days, then up it to 1/2 for 4 days to see if it is working on a nine year old.

Westy

http://www.theta.awarenesslife.com/

Have you checked how much water he drinks on a daily basis? Perhaps increase that ( incl. vegetable juice), and see what happens.
Some kids ( also adults) don't respond to the first call of "mother nature", don't take the time to go to the bathroom. When they ultimately go, the end of the BM has dried up.
A couple of simple solutions ( some you may have tried already? ): add soaked dried prunes to breakfast cereal, and /or one to two teaspoonful of flax seeds. Another idea worth trying is to give him a teaspoonful of psyllium seeds or husks in a tall glass of water( can add a little fruit juice to help get it down. Drink right after mixing, or else it gels too much. Should be taken on an empty stomach, in the morning and/or before going to bed.
Wishing you success.

I wish to thank those of responded to this. I will try what you've suggest I do. Thanks again.