An extremely very good book all about Charlie and Lola!

Lola loves dogs. So when Charlie takes Lola and her friend Lotta to the park with his friend Marv and Marv's dog Sizzles, Lola is thrilled. Marv lets her and Lotta look after Sizzles on the promise that they don't let him off the lead. Can Lola and Lotta keep their promise and look after Sizzles?