Has she had a vaccination? her heart worm pill? frontline? Has she had any bouts of pano (growing pains)? I ask all these questions because Gracie went through the exact same thing at 9-10 months old. We ran blood work - all normal. Heartworm and lyme test - normal. Fecal - normal. We thought maybe it was her Heartgard plus chewable as she had it a day or two before this happened so now we only give her the Heartgard pills. We also thought maybe it was her pano and she was self regulating. We never figured out with any certainty what it was and it never happened again. Lasted 6 days and then she was her crazy self again.....and has been since!!