I have a 10 year old male/neutured Siamese mix, 14.5lb. He developed a sudden strange gait (slight limp of hind legs and lowered posture) overnight and began circling to his left in tight circles upon picking him up and setting him down. No vomiting, nystagmus, head tilt, however no appetite. Couldn't climb inside litter box. About 10 hrs later after receiving ~130ml fluids via IV, he stopped the circling and his gait is almost back to normal. Appetite returned. His CBC and chem profile came back normal except for blood glucose ~227. He still walks down the hallway very closely along the left wall. He walked into an object on his left twice. No obvious ear discharge. What causes such sudden onset and remission of circling behavior? Is it reasonable to rule-out ear infxn since CBC came back normal? Thank you!