My yorkie spunky (4 yrs old)is acting weird he's fine one second and the next he's just laying there barely moving and i try picking him up and he yelps as if he were in pain... I've touched him all around to see where the pain is coming from and nothing its only when i pick him up... He ate fine today he was somewhat hyper but now he's just laying there and he won't even pay attention when i call him he barely lifts his head.... I'm worried!!