I actually took my baby to the vet once for a scratch on her eye after a grooming..and when he was checking her out said her tear ducts aren't completely formed. Said its a big problem with the smaller yorkies. Totally fine, just builds up more gunk in the eyes because the ducts arent able to clear it out. I bought tear stain removal at PetSmart actually that already has the solution on the pads, kinda looks like Oxypads from way back when!
Works great though, and never have to use separate tissues or cotton balls and just throw it away!