Battendog woke up this morning with the third eyelid in one eye about 1/3 to 1/2 across his eyeball. He occasionally paws at it so it's irritating to some degree. Over the last few hours (he woke at about 7am) it has fluctuated with being a bit better, a bit worse, sometimes the inner eyelid on the other eye does the same and sometimes not.
Anyway, he's at the vet in an hour or so to get it checked out but I just wondered if anyone was around who'd seen this before and what happened?