The first thing you should do is not panic! Most dogs handle change just fine, and sometimes the only thing that stands in the way of them being ok with a new situation is their owner’s emotions. Your only real decision is whether or not the dog will be welcome to continue sleeping in the room while your son is home. If he’s allowed to stay in the room, start teaching him where his new place will be, reinforcing with lots of cool toys and treats. If he’s not, don’t make a big emotional deal about it. Simply keep the door to the room closed, and offer him one or more alternative options. Resist the temptation to commiserate with him “Johnny’s being home will be hard for me, too, Spike” and go about your daily life as if all is well. Because really, in the grand scheme of things, it is!