Ummmm....I am going to have to check this out too. This past month, Mojo has had bad tear stains. In fact, this past year, we have noticed his eyes were really running. The vet did give us eye drops, but we do not use them all the time - I think because of something I read in the insert about prolong use of them or something - who knows....with me, I freak out about everything AND I hate taking/giving meds all the time. I will have to check again. Do you have the name of the drops you got from the vet? There is an eye gel you can get from the vet or I have even seen it at
http://www.petedge.com to. (can't remember the name - tri???)