My 10 and a Half month old Shih tzu Puppy ( GIZMO) has been a pretty fussy eater from the start. I have tried him on everything, now he won't eat his puppy food, he won't eat chicken or some of the other foods (homemade doggie recipes I have made him, please can you help me as he just isn't eating anything now. He has a few chicken treat sticks but he has totally gone off his food, please can you help me:confused: