Two days ago I noticed my dog was all hunched up at the back ,she was shaking and twitching and staring into space,her eyes looked like they were glazed over and she couldn't seem to walk properly ,she yelped when I touched her head but when checking her all over she didn't seem to be in any pain.This lasted for about 20 30 minutes then she curled up in her bed her eyes started to look brighter and she seemed to recognise me but she seemed scared and still shaking a bit. The next day she seemed fine but then this morning she was shaking and twitching again and doesn't seem herself please does anyone have any ideas of what could be wrong with her?