I think you would feel deceived if given a peanut butter sandwich, and after eating it someone revealed they had mixed powder from a pill into it.

Reread your sentence and look how much stuff you made up about 1) a scenario that’s completely fictional and 2) how I, a person you never met would react to it

I said I thought you would feel a certain way in that situation. Do you disagree?

Yes absolutely and completely.

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.

You have avoided answering by changing the scenario. Deception was implied. I'll take that as my assumption being correct and you were simply too proud to admit it.