My parents Yorkie, Little Dog, has this problem. The vets did all sorts of tests on her eyes and nose. Her problem is that her tear ducts are too small (I believe) and that's what causes it. I am pretty sure that is what is wrong with LD anyways. They gave her two sets of eye drops that even though she is supposed to be off of them, she isn't because as soon as they stop giving them to her then her eyes get really bad. They clean her eyes and give her the drops daily. One day, they woke up to find that an eye was crusted shut and they couldn't wipe it off and the vet (not their usual) said it was because of NEGLECT! That girl, nor any other, has NEVER been neglected since she's been in my parents care so you can imagine how terrible that was for them to be accused of.

ANYWAYS. Sorry to ramble. But maybe Sassy has that going on with her, as well. I'm hoping that all goes well at the vets!