I'm so sorry that you got bad news? What exactly is it that has you so concerned?
Twenty years ago, I got my first dogs. Bichon Frises, and I bought them at a pet store - (had never heard don't do this) Maybe the puppymill thing wasn't so bad then (does anyone know?) I bet it was 5-8 years after that before I first started hearing about puppymills. Anyway, I breed my dogs, no one else around here new what Bichons were then.
My dogs did both have champion bloodlines and shared a great-great grandfather. They produced huge litters - always 6-8 pups. We only ever had one odd incidence and that was a pup from the first litter, who was the biggest pup from the day it was born - She grew to be almost twice the size of the standard.
My petstore dogs lived into their mid-teens and never had health problems until old age started setting in. So, lets pray your furbaby will be the exception, too.
I don't even think there is a petstore around here that sells dogs - but we need to keep getting the word out about petstores and puppymills! If you do have problems with your pup, please file a complaint with the attorney general in the state where you bought your pup, and if the puppymill is in another state, contact their attorney general too. I know in Iowa they are trying to crack down on these folks.
Best wishes
Yorkiesmiles