Hi Liza-
I'm so sorry to hear that you've had some health problems with your daughters' pups but it's great to hear that Pierce and Mia are now doing well.
I was curious so I did a quick search to find out more about the "Puppy Boutique" and this is what I got...
http://consumeraffairs.com/pets/boutique.html
Regardless, as you said we all fall in love with our pups and as long as they're happy and healthy we could care less where they came from.
I live in Manhattan and have a great vet in Chelsea but I'm sure that Fran's suggestion is wonderful since she's been going to them for 18 years!
Best of luck,
Mojito & Irmi