The Call of the Wild : `Next in series`: White Fang. White Fang is written by Jack LondonWhite Fang has genre Adventure fictionAdventure fiction has examples: White Fang
[Human]: I really enjoyed the book The Call of the Wild and was hoping you could recommend something similar  [Assistant]: White Fang is by Jack London as is Call of the Wild.  You might enjoy that one too. [Human]: IS White Fang an adventure book? 
White Shadow is considered Adventure Fiction. You might also enjoy Wolf Brother if you like adventure fiction.