Rob,

From what I know, people with MPD experience a complete shift from one personality to another, and sometimes will not even remember being the other person.

Great video, this dog is showing two distinct things happening at once.

It may be a disorder incorporating different selves. I suppose it could equally be that the reflex that causes it to scratch itself is triggering without it being consciously aware of it and it is freaking it out.

The dog should definitely be in a lab.

Alternatively you may be the first person to diagnose a dog with MPD.

Regards,

Blacknad.