My chihuahua dislocated his knee last night and now he won't eat... we took him to the er vet they gave him a shot and he was fine all night... this morning he ate 2 pieces of cheese to take his meds and this afternoon he wouldn't eat his food so I gave him a little bit of chili... now he is not eating or drinking at all... however he does keep trying to jump around and ends up hurting his knee again... what should I do :confused: