Kellyn,
I was sorry to read what happen to your baby!! I know your heart is breaking!!!
But let me say, you came to the right place for help!!! YT'ers are the BEST!!! Not only will you find assistants on how to pursue with this matter but you will find lots of love & support here. Sorry I have no advise on how to STOP this breeder but others will some great advise.
Again, so sorry about your puppy!!!