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.
This. Otto would get very excited to pick up the kids at school, he'd just about loose his mind lunging and barking in frustration as they'd HI MOM run past him to the playground. It took patience and time. Now he just sits there like 'another day another pickup, who this kid touching my head?'
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.