ADVANCE FOR MONDAY APRIL 16 - In this Feb. 28, 2012 photo, veterinarian Kim Culbertson fills out paperwork while one of her surgical patients sleeps in Minneapolis, Culbertson works out of a mobile clinic operated by the Minnesota Spay/Neuter Assistance Program offering spay and neutering services to low-income pet owners around the state. (AP Photo/Minnesota Public Radio, Alex Kolyer)