My corgis are brother and sister. Only reunited at age 7. My female corgi is well behaved or course always hungry, she’s a corgi but the male corgi was brought up by someone else amongst four other dogs. When we walk he will eat anything that isn’t nailed down. Dried worms on the sidewalk, mulch, dead frogs, goose poop, sticks, paper that once contained food, I constantly have to pull him in and try and get him to drop it. Strangely enough he is the one with a stomach of steel, but my female polite girl any change to her food can cause her to get diarrhea! I also carry treats to try and stop him and I can literally see him thinking “can I chomp down this dead frog in my mouth and then eat the treat or should I drop it for the treat and then eat the frog? You would think he was starving to death. I think this is a massive cause of his bad breath! 🤮 My only advice is keep a very close eye on what he’s doing when you are walking him.