Is this something some breeds do more than others? I have never had any other dog do this, it is really weird to see. I have been told it is not uncommon, but still. What are your thoughts on this? Shes a staffie - whippet cross.
My chihuahua used to do that too. But when he would enter REM sleep his eyes would go crazy, moving side to side, it was really creepy. It's probably not significant. Humans could do it too with practice.