I am trying to figure out what could be wrong with my dog. She is a 8.5 year old female chocolate lab. One minute she is acting normal, and then she is walking into things and falling down. Seems like she can't see, trembles a bit, and acts strange. I was thinking that it could be her having minor strokes? When the episode passes, she seems back to her old self, though she takes a nap. This has happened twice, and the first one happened after playing ball..

Any suggestions or thoughts?