That's an awesome idea Brodysmom, I'll have to try that.
For what it's worth, when I shopped at this great holistic dog food store in WA I inquired about the same thing jcx. I was looking for a low calorie kibble to slim my husky just a hair. The guy was awesome and recommended keeping him on his normal kibble and just cutting back on the feeding amount. I cut back on his regular kibble just a tiny bit like he suggested and sure enough got the results I was looking for.