For a fun, children's e-book with a dinosaur-turned-pet, check out this e-book: Candy and the Cankersaur by Jason Sandberg (amazon, nook). It may even inspire them to create their own dinos that survived!
Candy's rich, and somewhat neglectant, father gives her a pet dinosaur (a cankersaurus rex). The neighbor boy is jealous and takes some drastic actions, but in the end decides he would rather have friendship.
I couldn't find the 'theme' of the story, I thought the writing could have been stronger in some spots, and Candy's father never seemed to see she just wanted to spend time with him. However, it's a light, amusing read for kids with bright pictures that 'pop'.
Sandberg's other paintings, ebooks, and bio.