Mordecai Richler 
Jacob Two-Two and the Dinosaur [EPUB ebook] 

When his parents return from Kenya with a cute little green lizard on his eighth birthday (hes two times two times two), Jacob Two-Two is thrilled. But it isnt long before Jacob realizes that his new pet Dippy isnt a lizard after all. And as months pass, it is apparent Dippy isnt so little either. Soon Dippy is attracting all sorts of unwanted attention and before he knows it, Jacob is on the run from the Canadian government with a full-grown dinosaur to hide.From the Hardcover edition.