Your Boy is sure glad to be home im sure (as are you). Psi is my food agression dog so I know the "no food" routine. They all have to eat treats infront of me (crums included) If they have a bone and I need to leave the room all bones get rounded up and returned when I get back. He has never hurt one of my pack regarding food but tore the ear off one of the foster dogs at his foster home. He is snappy but lucklly cause of rules &watching all food we have been safe. Now saying that he has torn into snowman 2x once in the car and once at home when i was not here. Both required stitches. Now they are all muzzled when I am gone. Neither of the insidents envloved food. Psi can be pushy and snow is a bit wimpy and I think that plays a part in the bites.
I just wish you the best and honestly I would consider muzzling the pack. My 3 have them on about 6 hours at a time and have no issue. Infact when I put them on they are fine. But if I put them on at a "fun run" with other greys they are stright away trying to rub them off on my leg