He's all about change. She's not. Senior year-not the biggest deal in the world, right? Except that it is, because everything is changing. Most seniors worry about their dates for school dances, soaking up final memories with friends, and planning life after graduation. Seventeen-year-old Dinah Finaylson has other worries, like students brushing against her and her autism service dog, Higgins; like winning board game matches...