Master! It's me. You're right there. I can feel it. (companion dog)

Question

- Chuchu? Is that you? (dog's master)
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The master of the dog found the missing dog after a long time. In this dialogue, do we have to use 'that' alone? How about the following?

1. Is it you?
2. Is this you?

Answer 1

Yes, you could use any of those pronouns.