My 7 year old Cocker Spaniel Has been a Very out going and one of the most friendly dogs i have ever met but this past month he has been hideing alot...like ill come home and he was always at the door waiting for me..now i have to go and find him and he will be in the back of the closet like in the WAY back where he will have to crawl over like lots of crap to get back there...and like he will be sleeping aross the room and wake up suddenly and run to the nearest bathroom and push open the door and sit behind the door in the dark..i find this very strange.. and not normal for him...Any one have any ideas why he might be doing this?