This novel was removed from dictatorships in Europe during the the 1920s and 1930s. From Wikipedia: "The Call of the Wild is a novel by American writer Jack London. The plot concerns a previously domesticated dog named Buck, whose primordial instincts return after a series of events leads to his serving as a sled dog in the Yukon during the 19th-century Klondike Gold Rush, in which sled dogs were bought at generous prices."

Trust, a 5-year old Greyhound. Had the most perfect life for a dog, then it all changed, when earth was invaded by aliens. Separated from her humans, with a promise she made with her owner. She must keep her promise she made with Rose, just before "they" came to take Trusts humans away. Trust must make her journey through the empty streets, buildings, forests, to find Rose. For she already knows the rest are dead. Trust must learn to survive and defend herself from the aliens. In order to find Rose.