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I don't think it's really trainable as it's happened literally once or twice in three years and he's fine with normal treats and us going near his bowl etc.
Make sure all family members and everyone who visits know never to approach or interrupt your dog if they are eating or have a chew.
i think this first item on the bullet list of actions is all that was needed as emma persisted after he'd warned her with a growl.
if we see any more signs then it'll need correcting but i think it was an unfortunate one-off and I was just opining that it's a shame he did it when he finally discovered a new source of entertainment.
Benny does this, his favourite place usually to hide his treats is to tuck it underneath either me, my partner or my mums legs or behind our backs. I think that's part of why it caught my partner off guard that he snapped trying to take it off him. I suspect a large part of the reaction is when it's a "new" thing he's not experienced before, in my case a minging bit of dead bird, in her case a previously ignored chew toy that he had only just discovered was edible and also amazing he has no idea if he'll ever get it again so it provokes a stronger reaction.