She had ear mites, the vet prescribed some drops that we already applied, they seamed to help, because the last time we took her to the vet, the mites were gone, then its when the ear came down. About the breeder, she doesnt have a pedegree, but when we got her, both of her ears were up, they came down once while she was teathing, but they came back up. Now i haven't seen her loosing any teeth, so i don't know what could be the cause, it has been almost 2 weeks since her ear is down. Thanks for your help!