When Life Gives You O.J. by Erica S. Perl (author) (US edition)

Zelly dreams of a dog. She gets a plastic orange juice carton on a leash. That’s what happens when life gives you a nutty grandpa! If you love animals, you might’ve been there. You ask if you can have a pet. ‘When you’re ready’, your folks say. But now Zelly’s grandfather, Ace, has hatched a truly barmy plan to help her prove she’s got what it takes. It involves a ‘practice dog’ named O.J. Yes, that is a plastic orange juice carton on a leash. Now Zelly must decide if she can bear this level of shame to finally get a real dog of her own.