Lulu Series by Judith Viorst

It's Lulu's birthday and she's decided she'd like a pet brontosaurus as a present. But when Lulu's parents tell her that's not possible, she takes matters into her own hands and storms off into the forest to find herself a new pet. But when she meets a brontosaurus she realises that maybe he isn't right as a pet after all.

In this stand-alone sequel to "Lulu and the Brontosaurus," industry legends Viorst and Smith once again prove that even the loudest, rudest, and most obstinate of girls can win readers over.