Short answer: Ox, Rooster and Dog look most hardworking
Ox represents endurance. Rooster represents precision and discipline. Dog represents responsibility and loyalty. These signs are not always loud about effort, but they are often associated with finishing what they start.
Ox is long-distance effort
Ox energy can stay with repetitive, practical and demanding tasks. It is useful in work that needs routine and responsibility. Its risk is over-carrying burdens without asking for help.
Rooster works through standards
Rooster does not simply do more; it wants things done correctly. This supports editing, quality control, finance, operations and technical work. The challenge is not turning standards into constant criticism.
Dog is driven by duty; Dragon and Horse by goal
Dog often works hard because it made a promise. Dragon and Horse can work intensely when the goal is visible, but they need rhythm, recovery and completion habits.
Look at the Month Pillar for work rhythm
The Month Pillar often says more about career rhythm than the year animal. Earth supports responsibility, Metal supports discipline, Wood supports growth, Fire supports drive and Water supports strategy.