It would be pretty funny if that was a manifestation of the part of him that ate Miko's puddingI'm pretty sure the plot twist is that the dog thing isn't a separate ghost but like, the dads tail or something.
That would explain why it is always next or behind him.
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3. Dad is a pure spirit and we have only seen Michiru only eat the ugly ones, she doesn't eat pure spirits like dad.
4. Dad's ghost is hella strong