Lai Chun Sing (Kent Cheng) has been in the police force for 30 years. During one investigation, his assistant police dog sacrificed its life to save him. Struck by the death, Sing decided to join the Police Dog Unit. In 25 years, he advanced from a dog caretaker to an instructor and he now plans to use his retirement money to open a dog care center, allowing dog owners to bring their dogs for training and play.

Sing's wife died a long time ago, but left him with an obedient daughter, Lai Sin Yue (Linda Chung). Yue follows after her father and loves animals as if they were human. This eventually leads Yue to become a veterinarian. She later decides to help her dad and moves to the countryside to help with his dog care center. Her determination is driven by the fact that she wants to make sure all animals are treated lovingly.