Governor Pat Quinn signed a law Saturday that protects those who purchase dogs or cats from pet shops.
The legislation protects consumers and animals, while encouraging pet stores to work with reliable and safe breeders, not so-called 'puppy mills'.
It gives those who purchase a dog or cat the option of a full refund, exchange or veterinarian bill compensation if a licensed veterinarian determines the animal was sick or diseased when purchased.
Pet shops must also provide buyers with the animal's medical history.
The new law does not apply to not-for-profit animal adoption operations such as animal shelters.
It takes effect January 1, 2014.