The "The O.C" start Rachel Bilson is well known for her role as "Summer Roberts". Well known among the Teenage Populice, she won the award from "Choice Hottie".
Her fiancee Adam Brody who was also her co-star gave her a Pit Bull for her birthday. The two of them grew so attached to it, that they now share custody over "Penny" even though they are no longer together.
Contrary to popular perception, Pit Bulls feel pain just like any other dog. Breeders have tried to make the dog ignore pain or discomfort in order to get the job done, and this is the reason why some people think they feel no pain.
They don't "Lock their Jaws" either.