A team of expert trainers, and presenter Nick Grimshaw - dog-dad of two - take on the nation's naughtiest dogs... and their humans. Eight-stone puppy Ghost, a Cane Corso mastiff, is striking terror into the heart of the neighbourhood, and his owners. While his guard dog credentials are impeccable, can he be trained to be compatible with family life? Will he even let trainers Sean and Kamal come anywhere near him? And newly-engaged Chelsea and Owen have their hands full with, and their relationship tested by, Chelsea's six chihuahuas and a cavapomchi called Mr Bollinger. 

Although he may look cute, fluffball Dougie has been branded a danger to society by local law enforcement. If he bites again, the authorities have threatened to step in. Can Libby and Tom turn things around? Chaos follows St Bernards Bodie and Bailey wherever they go - destroyers of vases, and chasers of cats, squirrels and neighbours. Trainers Sean and Kamal want to help Sam get some control over her fluffy demolition squad. And Michelle hoped an English sheepdog puppy would comfort her widowed dad. But relations between man and pooch have broken down. Trainer Victoria has an idea of how to mend the relationship.