Saving Bone — Shelley Stoehr

Izzy and bff Seven (whose name was supposed to have been “Steven”, but the “t” was left off his birth certificate) set out to rescue a dog, Bone, from its abusive owner. Although they fail repeatedly, they cannot stop trying �" though Izzy wonders why not. What's so important that they have to risk "life and limb" to save this dog? But then Izzy learns a truth about Seven, a reality that is so horrible, she realizes it isn't only Bone who needs saving �" it is Seven.