I was going to purchase another yorkie from a breeder but they wanted me to give it some kind of medicine because it had something called cocashia or some strange name like that. The breeder wouldn't say exactly what it was. She was strange about it so I didn't take the pup. I told her I would think about it because she said she didn't know if it was contagious, but she said it was nothing bad. Anything with a name like that can't be good. So I wanted to do some research. She said it would go away with the medicine. I am ify because I already bought a dog once that I brought home with parvo from a breeder. What do you guys think?