Can I take a Shiffon dog Breeder to court for vet bills after purchasing a puppy and finding out two days later it has parvo.

Yes, you can sue her, but winning a judgment (and there is no guarantee you will win) and collecting a judgment are two entirely different things. Given what you've said about her living conditions, I am going to guess that she does not have the money to pay any judgment and if she filed for bankruptcy it is unlikely you would receive any money. And to play devil's advocate for a moment - if you knew about the deplorable conditions the puppy was living in, how could you not have expected him to be ill? Unless your sales contract stated that the puppy was in good health, I think you will be throwing good money after bad in suing her, but only you can make that decision. you might want to speak with a local attorney for further guidance. I hope your puppy gets well soon.