Claudia,

I usually put new kibble in the empty dish and pour the old kibble on top
I try to do the same thing, except I put the NEW kibble on top of the old. Problem is they eat down to the old kibble and stop. UGH!! It gets frustrating because there are SOOOOO many hungry cats out there (Ya know, like when our parents made us feel guilty about starving children in Beafra when we left food on our plates??).

Maybe I'll put the old kibble away and feed it to the feral I'm helping out. At least it won't go to waste. That is unless HE doesn't eat it.