An undercover investigator with the Humane Society of the United States worked for about two months at the Petland store inside Twelve Oaks Mall in Novi.

NOVI, Mich. - When getting a new puppy, being cautious and informed can help you avoid heartbreak. Within a couple of weeks, the puppy started showing signs that something was wrong. MORE: Help Me Hank investigates concerns about health of dogs purchased at Novi PetlandShe said she took the dog to a veterinarian and bills started piling up. "They did do the liver test the next morning because he had enough blood in his body by then," Blankenship said. "They did the liver test, and they found out he had a congenital liver disorder."