My 1.5 year old Shepherd is all of a sudden very skittish and scared whenever he is in the house. He shakes at the door ways to certain rooms but if I go in the room and call him he will come. The only thing that has changed recently is my family went on vacation for 10 days. While we were gone my mother watched my dog and her golden retriever stayed with him. I'm not sure if he is just depressed that his friend is gone or if there is something bigger going on. Max will run outside and play fine, still loves rides and playing with other dogs but once he gets in the house he freaks out.