Puppy eating poop

[budgrrl]

Does anyone have any tips/tricks to get puppy to stop eating (or trying to eat) our other doggie's poop?
We scoop it constantly, however, she's pretty quick and literally watches Chewie poop, then races over to eat it *gag*

I've heard there is a powder to put on their food to make their poop taste nasty (as opposed to ??).
Any other tips to get her to stop?

She, as well as Chewie will raid the kitty litter like its a tootsie roll buffet, but at least we can limit their access to the litter box, whereas outside, it's harder to prevent.