My Sadie is a poop eater, too. She's not into her own, though. She will occasionally get Riley's, but usually it's smaller dogs' poop. We have a dog park in our neighborhood, and there are a lot of vines. People pick up the poop outside the vines, but no in the vines... It creates a cycle, b/c no one wants to walk in the vines to pick up their dogs' poop-you don't know what you'll step on (can't see a thing through the vines).
Riley likes the vines a lot and will roll around in them (so far he hasn't come running back to me with poop smears on his coat, knock on wood). He chews on something, but I think it's the leaves (see one of the pics in his bio) and maybe acorns-haven't ever found anything when I opened his mouth.
Oh, and the vines are where Sadie finds the dead squirrels (two in the past two months)... they aren't cut or bleeding, just dead and stiff... Makes you wonder. She's never caught a live one (not sure that she'd do anything but carry it, as she's cornered a baby bird before and just bounced around trying to get it to play with her).