Here’s what would actually happen if this fictional scenario did occur:

If someone hands me something to consume, no matter how much I trust them, I would ask “cool thanks, what’s in the sandwich?”

Now you, a non-deceiver, would say “peanut butter and pharmaceuticals”. And I would say “oh, I’m not sure I want that, but thanks for being honest”

I hope you see how this analogy does not map to dogs.