I work at a vet clinic and they sell a product which is packets of msg and wheat gluten. Not sure what the gluten is for (flavour maybe?) but the msg once metabolized is very bitter- therefore turning any dogs poop extremely unpalatable for them. This only works if you can feed it to every dog who's poo your poo-eater can get to. The msg is safe for dogs and the quantity they need to eat is pretty small.
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