Congratulations on your new puppy! It's great that she gets a long well with your older dog. My older dog just tolerates my Yorkies
I was trying to figure out if you purchased your puppy at a pet shop, or were asking about the breeder. But I did a quick Google search & figured it out. Apparently, Dawn Coffman supplies various pet shops with various breeds of dogs. I'm not sure if this is the same Dawn Coffman that your pup originally came from. But the Dawn Coffman I found supplies to Petland in Dunwoody. So if this is the same Dawn Coffman, it's pretty certain that your pup came from a puppy mill. If you haven't taken your new pup to the vet yet, I would try to schedule an appointment as soon as you can. With all of the tragedy that goes on inside of those mills, it's likely that your pup may have some health problems. A lot of times, those problems need immediate attention. And if your pup has anything contagious, your older dog could become sick. I'll keep my fingers crossed that this isn't the case. But if you do find out that your new puppy is sick, you've definitely come to right place. There's a lot of information & support on Yorkie Talk for issues like this. Good luck!