Absolute Zero by Helen Cresswell
When Uncle Parker wins a luxury holiday in a slogan competition, the rest of the Bagthorpes are determined that they can do better. Suddenly there isn't an unfilled entry form to be found as they jauntily compose jingles, scribble slogans and fire out forms to the right, left and centre. Only Jack and his hapless hound Zero refuse to be swept up in the hysteria. After all, everybody knows that they could never win anything. So how exactly does Zero find himself the most famous dog in England ...? BLHelen Cresswell has written over 40 much-loved books for children, as well as adapting stars such as The Demon Headmaster for television.