Thanks everyone for your replies! My friend is a bit more encouraged to hear that she might not have to pay for another month, but is still very stressed about the whole thing. There is nothing written in the contract about being pet-free or that the provider has to give any notice about getting a pet. However, my friend does still have the original ad, where is says the daycare is pet-free. She also has an email exchange from before their interview where my friend told the provider that her son was allergic and confirming with that the home was pet-free, in which the provider replied that yes it was. But that's all she really has.