At ten months the dogs have hit puberty and are starting to show some teenage rebelliousness. There are mixed levels of success in the assessment, and one of our pups falls gravely ill.

With the 12 month experiment now complete, the Australian Border Collie siblings reunite to face their final challenge. It's neck and neck but one dog shines brighter than the pack and is crowned Champion Muster Dog.

Six adorable puppies - three Collies and three Kelpies - embark on a journey to meet their new owners and compete for the title, Champion Muster Dog. Over twelve months, we watch as they navigate challenges and milestones.