The correct pronouns to complete the sentence are "who" and "who". The revised sentence would read:
"Will who we met yesterday is going to groom her dogs who was he again? I don't remember meeting anyone."
However, the sentence is a bit awkward. A more grammatically correct version might be:
"Who we met yesterday is the person who is going to groom her dogs. Who was he again? I don't remember meeting anyone."
In this case, you would use "who" because it serves as the subject of the clauses. "Whom" would be used if you were referring to the object of a verb or preposition, but that is not the case here.
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