Yep Bo is trying it on with the old dog. I would reaffirm the old fellas place as above Bo, by feeding him first and letting him go through a door before the young one. Maybe move the old fellas bed into your room for a couple of nights, but watch for Bo having a whinge about it. maybe give the young boy a bit more obedience stuff like sit, stay etc...
The old guy will be letting Bo know that he is below him which may lead to a bit of a huha. Bo coming in, will be because the old dog kicked him out of the lounge which he's trying to claim back off the young upstart.
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