Just wondering if anyone has any experience of this? My border collie cross has had it for the six months we've had her. She's been seen 3 time by our vet and each time been given drops (Maxitrol) which clears it up for a few days but this time hasn't improved it at all. If anything, it's worse. Our vet says it may be allergies, eyelashes on the inside of her eyelid or blocked tear duct and wants to sedate her to investigate. WHat do you think?