He already thinks the entire planet is food (tho he's become a little picky about what he finds in his dish).
I walk him in a nearby hayfield where he looks for what the rabbits and deer leave behind (and who knows what other critters). When I stop to pick blackberries, he eats them too, right off the bush. His favorites tho are hickory nuts, pine cones, and the mulched grass clippings that come out of the lawnmower.
I'd post a pic, but I haven't got my head round that yet.
Oysters, tho . . . that's new. I'v know dogs that caught fish.