Pls help us understand what's happening to my sweetest german sheppard - My 10 months of german sheppard stopped eating anything, slowed down and hides to closet most of the time. just a week ago he was very active, running, jumping all the time but somehow, he lost interest in everything including his appetite in a sudden. we took him to vet, he had ultrasound, xrays, blood work, neurological tests and everything but the doctors still say he's a mystery for us. we're trying to find what happened to him and how he can regain his appetite and active character. one more thing, he had some fever at first and he's using antibiotics and painkillers now in any case of an undiscovered infection by the advice of internal medicine doctor but his fever is normal now and he's not having any pain, still he's not eating, hiding and extremely lethargic. pls help us figure out what's happenning to him and how we can fix him.