Read "The call of the wild" by London, Jack for free. A classic public domain work covering adventure stories, animal welfare -- fiction, dogs -- fiction. Available in full text from Project Gutenberg.
Adventure stories
Animal welfare -- Fiction
Dogs -- Fiction
Feral dogs -- Fiction
Klondike River Valley (Yukon) -- Fiction
Nature stories
Pet theft -- Fiction
Sled dogs -- Fiction
This book is in the public domain. Free to read and download from Project Gutenberg.