Within the last few days, I have noticed that Belle's 3rd eyelid is showing in both eyes- it will show for a few hours, then go away, then come back. Her eyes also look a little "sunken in". She seems normal otherwise - she acts like she can see fine, she's playing, eating, etc.
I have been researching Horner's Syndrome and Haws Syndrome, and it appears to me like this is what she has, but I'm not sure of the difference between the two? One of them says that the 3rd eyelid showing can be due to parasites or intestinal upset, but Belle never leaves the house and her poops look normal. Anyone know anything about Horner's and Haws Syndromes?