The Nightmare Club 3: A Dog's Breakfast by Annie Graves
Did you ever hear that telling a nightmare makes it fade away? It doesn't. Not here anyway. Welcome to the Nightmare Club's Halloween Sleepover. You might not last till morning.
Glen is a nasty little boy who always moans and lies. After a strange encounter in the woods, he suddenly disappears, and the only one who seems to know what happened to him is a dog. And everyone knows that dogs can't talk. Right?