Some of our dogs will eat poop from time to time. I had a lab mix who ate a steady diet of turds her whole life - and she lived to be almost 15. The dog was nearly bulletproof, never had a thing wrong with her, except the bad breath.
She was a connoisseur: she would hunt around for a turd that was just the right age, and in her last couple of years actually "cellared" turds by collecting them lining them up on a rock behind the barn and check on them until they were just right. She would eat no poop before its time...
They especially like 'em frozen - "poopsicles" we call 'em.
And we've tried everything to get them to stop, and short of a racing muzzle there's not a whole lot that will stop a dog that's bent on chowing down on a butt nugget.
I don't know if we've tried the Forbid stuff, I'll have to see if it works.