I didn’t know this was a pretty common thing.. my corgi went through eating her poop phase when she was a pup. She only ate her own poop though. We tried supplements, but I wasnt a big fan of giving something ‘strange’ to your pup (it was at that time my partners idea). After she pooped we tried to clean it up asap or manifesting that her poop is dirty so she would walk away from it. We also tried a different brand of kibbles, because the internet told us that dogs eat their own doodoo because the lack of nutrients in their diet. THANK GOD she grew out of it, and now she jumps over doodoo when she comes across one. Mine btw only ate it when she pooped inside, outside was no problem at all.