Veterinary clinic volunteers Amelia and Sam have to look after Coco the Labrador for a week. The mischievous puppy is very naughty, so she may be in danger: a mysterious dog-biter has appeared in the town! The children send Coco to a dog school, and their classmate's scary dog, Sparkle, joins the training. Will the friends manage to cope with the dog's troubles? And is that scary biter really that dangerous?
