I agree with the rest. I believe the breeder you acquired Tink from claimed she was a "teacup" Pomeranian, no? If so, get on this breeder's butt like a flea yourself! If Tink's condition is hereditary, you need to stop this vicious cycle of backyard breeding and close that horrible breeder down. I'm so sorry you have to go through this, but, unfortunately, many of us have felt the after effects of BYB-ing as well. We'll always be here for support.

Rememeber, next time you see the vet, ask if the condition is hereditary or could have somehow been affected through the breeder's actions (many BYBs have been shut down simply due to selling extremely young puppies who are not physically mature enough to survive on their own). Also, how old is Tink? I'm assuming she's around 9 weeks old since you're bringing her in for her shots at 12 weeks. In my and nearly all other reputable Toy dog breeders, no Toy puppy should leave their littermates until 10-14 weeks. This could help with your case against the breeder. Good Luck with Tink and, hopefully, shutting down the breeder!