my 4month old yorkie is tiny and has already had a hypogylcemic attack and has been doing very well lately, eating more and been alot more active.... however when i left 4 work at 10 this morning she was fine and i was home alot later then usuall about 5, usually id only be away til 1.... she never came 2 greet me at the door lik she usually would,she jus lay curled up, she hasnt eaten 2day yet and i dont think its a hypogylcemic attack as shes still very alert and not lethargic like the last time but just seems 2be shivering alot.... any ideas on wat could be wrong???? i get soo worried when shes not herself....