Your son coming home, may be too much stimulation. A rejoining if the pack. He does not know how to handle it.
If it were my dog, he would get a solid 45 minute walk prior to picking your son up. Then, while waiting for the bus, do some obedience. Make him focus, do basic commands, give him something appropriate to do.
Have your son give him some basic commands. Turn it into a training excersise. Engage his mind.
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