Guards what it loves long after loving stops being convenient.
Dog is the branch of the evening watch, the hours spent guarding a house that has already gone quiet. In a chart it reads as loyalty with teeth: you keep faith with whoever earned it long after it stops being convenient, and you notice fairness violated before you notice much else. People experience this as trustworthiness, sometimes read as suspicion or rigidity when it's really just vigilance. It shows up loudest wherever it sits in your four pillars — a year Dog carries it into your public reputation, a day Dog makes it your own temperament.