My 1 1/2 year old was found lethargic and generally mopey on Tuesday. He did drink and pee but no appetite. Wednesday he was the same way so I took him to the vet. His temp was 103.2 but All blood work was normal, including test for Lyme. But they started him on doxycycline since Lyme can take up to 10 days to show up in the blood. After 2 doses, he still isn't better.....sluggish and mopey. But he does have an appetite and had a normal bowel movement last night. If he does not improve by tomorrow, the vet wants to know. Any thoughts as to what it could be?