Here is a law that applies to you. I am not familiar with red leg, but I'll write an email to the store with this link and see what happens. I f you'd rather send the email let me know. I'll wait until you post.
LEMON LAWS

Because the risk of buying a sick animal in a pet store is so high, several states (AZ, AR, CA, CT, DE, FL, ME, MA, MN, NV, NH, NJ, NY, PA, RI, SC, VT, VA) have enacted "lemon laws" that give pet store consumers some protection. For a complete list click here.
Pet lemon laws give pet store customers the right to return a sick or dead pet (most laws apply to dogs, sometimes cats) for a refund or replacement. Most also give customers the option of retaining the pet, having it treated and getting some level of reimbursement for veterinary expenses (the amount of reimbursement is usually limited to the purchase price of the pet plus sales tax).
In most states, the owner has one to two weeks to return the animal, with a certificate from a veterinarian stating that the dog has a serious disease or congenital defect that was present when the dog was sold. If the dog suffers from a congenital disorder, the owner may have up to a year to return it to the pet store and/or get a refund.
If the pet store refuses to refund or reimburse a customer within a certain number of business days following receipt of the veterinarian statement, the customer can file an action in court to resolve the dispute. The prevailing party in the action is usually awarded reasonable attorney fees if the other party acted in bad faith in seeking or denying the requested remedy.
Pet stores do not have to pay reimbursements if the animal's illness or death resulted from maltreatment, neglect, or injuries that occurred after the sale; or if the veterinary statement received at the time of sale discloses the disease or condition. Parasites are not a qualifying illness for compensation under most laws.