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Veterinary clinic volunteers Amelia and Sam have to take care of 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 the scary biter really that dangerous?