This is a tough one. Most of the time..unfortunately it's Buyer Beware. I feel horrible for your sister..and obviously this "person" is a despicable human being. You could try a dachshund rescue in your state. Each state is different and unfortunately southern states have very lax rules pertaining to breeders. I'm sure the humane society and any local ASPCA would be overwhelmed. I'm afraid I would be so angry but put my money and energy into getting the pup as healthy as you can. I'm so sorry..maybe someone else has better options.