What causes the eye goop?  Sophie seems to only have it in one eye.  Some days more than other days.  And then it will go away for a day or two and before you know it, it is back again.  She goes in on Tues. for her stitch removal from her spay last week and I was gonna ask her Vet.  Since it was only one eye, and rarely, but once in awhile, she kind of squints out of that eye, I thought maybe it was a hair poking her or a possible infeciton.  But it's just plain dark goopy stuff.