"The Cat-Dogs" opens with the same-named short story by Susan Price. It takes place in England, where a lot of these stories occur. This one is about a young woman who raises a litter of unknown animals (a mix between cats and dogs), only to have them grow bigger and seek human victims. By the synopsis on the back cover, I thought this book was about creatures like this; but the other five short stories involve everything from possessed pianos ("The Piano" by Diane Hoh) to houses ("The House That Jack Built" by Garry Kilworth) to train stations ("The Station With No Name" by Colin Greenland), as well as other beings like the Devil ("The Devil's Footprints" by Malcolm Rose) and a group of vengeful toys ("Softies" by Stan Nicholls).
A Scholastic book. Teeth like dogs and claws like cats. Cat-dogs love to hunt - Humans. There are six stories in this collection. On back cover - "Each story contains six unforgettable terrors guaranteed to scare you to death."