Chained — Lynne Kelly

After ten-year-old Hastin's family borrows money to pay for his sister's hospital bill, he leaves his village in northern India to take a job as an elephant keeper and work off the debt. He thinks it will be an adventure, but he isn't prepared for the cruel circus owner. The crowds that come to the circus see a lively animal who plays soccer and balances on milk bottles, but Hastin sees Nandita, a sweet elephant and his best friend, who is chained when she's not performing and hurt with a hook until she learns tricks perfectly. Hastin protects Nandita as best as he can, knowing that the only way they will both survive is if he can find a way for them to escape.