I'm having a (dangerous, I think) issue with Codex--7 months old.
Since I got him at 8 weeks we've worked on leave it (lass) and more recently drop it (aus). In a controlled environment he does great. I can put an open top kitchen trash can filled to the brim, brooms, shoes, everything he likes to play with but shouldn't, tell him lass, and he won't even look at it. He gets it so well it is hard to even do to many repetitions when training as he is doing leave it before I ask.
Outside, however, I'm having trouble upping the distraction level and completing successful training exercises. In the spring, it was deer poop. I'd have hot dog cut up as rewards, find some deer poop, let him discover it, say lass and ... he ignores me and tries to eat the poop. I can wave hot dog in front of his nose but it makes no difference. Fresh deer poop is much higher value than any meat or treat.
With deer poops it was just annoying. This summer has been crazy rainy in Colorado and there are hundreds of mushrooms growing under the pine needle duff. Codex has taken them to rooting them out like a pig after truffles and eating them. Again, the good lass/aus training inside goes out the window when it is a tasty mushroom. My assumption is that mushrooms can be as dangerous to dogs as they are to humans. This morning he ate parts of a few as I tried and failed to stop him. A half and hour later he puked up breakfast plus mushroom pieces in his crate. I'm very worried he is going to eat one that will do serious harm before he can puke it up in defense.
I'm looking for tips on how to train a reliable leave it / drop it when he considers the item he has more valuable than meat / cheese / anything else. As a secondary question, seeking out and eating mushrooms seems like an anti-Darwin activity. I can only assume wolves don't eat poisonous mushrooms in the wild?