Mars in the 6th house shows a person who is initiative, active at work, and loves to lead. The 6th house represents service, daily activities, concerns and chores, illnesses, and domestic animals.
A person with Mars in the 6th house is not afraid of competition and likes to assert themselves. Mars in the 6th is not particularly fond of subordination and always knows what needs to be done to make the work process most efficient.
Whether this person is willing to obey will depend on the character of the interaction between Mars and Saturn. If Mars is in a strong, harmonious sign, the person will obey, but still contribute their own ideas. If Mars is in stressful aspects, there may be conflicts with colleagues or subordinates - the person may create tension and pressure others.
Such a position of Mars is often found in owners of small and medium-sized businesses, who rarely manage large teams. It gives a self-reliant person who is not afraid of physical labor. Professions often include military, athletes, surgeons, butchers, masseurs, and activities related to metal.
Since this house represents daily duties, such a person may also be conflictual in the family, so it's better to channel all their activity into their work. In terms of health, the person may get ill suddenly, with a rapid spike in temperature, but the illness is often short-lived.
Regarding animals, this person may prefer aggressive or highly active dog breeds that they can train and engage with, as a way to redirect their excess energy.