I read bone. It is a fantasy. The book was about Fone bone and smiley bone trying to return a rat creature cub to the wilderness mountains. They run into rock  jaw the enormous mountain lion and also the master of the border. It gets more  complicated when they befriend a group of baby animals who are being orphaned by rat creatures. Then everything comes to a earth shattering clash between rock jaw and kingdok the leader of the rat creatures.