I copied your prompt verbatim to ChatGPT and to Google.

ChatGPT kept the charade for all of one sentence. Then it dropped to talking about "your dog" the rest of the way. It even starts the final paragraph with "if, instead, you mean you (a human) ate them...", and finishes with the question "is this about an actual dog or yourself?"

Google did consistently refer to me as a dog, but its entire focus was on the steps "your human" should take, no advice for the dog itself.

In both cases, it looks like the first person roleplay was entirely inconsequential for the usefulness of the output. I think the current gen AIs have outgrown this trick and you can safely forget about it.

You have to steer it back with "No I'm a dog"