Poor Kingston, I'm glad he's feeling better. Momo had the same #2 problem after he got neutered. It's from stress being in the hospital, neurogenic. I'm a little late, but here's a *(warning, pics of #2) graphic* link:
DIARRHEA IN DOGS AND CATS - General Topics - ThePetCenter.com - The Internet Animal Hospital
BTW, brown rice is harder for them to digest...white rice should do the trick. Binds everything up.
Aww, sweetie...you should eat something!=)