The Seaside Sleepover by Jacqueline Wilson

The holidays have finally arrived, but Daisy is bored. She'd love a proper holiday at the seaside, building sandcastles, eating lots of ice cream and maybe even spotting a mermaid in the sea. Daisy's sister, Lily wants to come too but it's hard to push her wheelchair on the sandy beach. Daisy's summer gets a bit more exciting when she starts looking after her neighbour's dog, Scruff. Daisy has always wanted a dog of her own to walk and cuddle. She knows Scruff would love a trip to the seaside too! Will Daisy, Lily and Scruff get their dream holiday and maybe even have a seaside sleepover?