The 6th house is the house of service, the house of our daily occupations, cares, troubles, illnesses and pets, as well as the conditions in which we work. Pluto gives a very great power, powerful concentration and workload at work. Therefore, the activity of such a person may be related to the Plutonic sphere - these are miners, metro workers, resuscitators, firefighters, military personnel, nuclear physicists, psychoanalysts, financiers, funeral service workers, etc. Or he works in stressful working conditions, this can be both physically hard work and constant pressure at work: such a person can often be nagged at, or intolerable working conditions can be created for him.
Pluto in the 6th house gives a very strong-willed, hardworking person. And with a strong volitional card, of course, it will show us a strong administrator who can manage a large team of people. And if such a person is forced to work for hire, he quickly becomes a boss. Or, if the card is not strong enough, as mentioned above, he may be under constant strong pressure. Or he works in a large and powerful organization with rigid rules, for example, in the power structures.
The topic of illnesses, cares, troubles... As we already understand, with this position of Pluto, this is not an easy topic. If there is a connection with the 2nd, 8th and 12th houses, this may indicate a predisposition to tumors or cancerous diseases. Or it is an indication that someone in the family is sick, and he needs to be cared for for a long and persistent time. Therefore, it is important for such people to take care of their health, especially energy practices (yoga, qigong) and physical activity.
Pets... Animals are usually chosen on the basis of usefulness (of course, if there are no other planets in the house). That is, for example, if it is a dog, then it should serve, guard and, of course, these are large breeds, not some decorative ones. And since Pluto is the ruler of Scorpio, there may be mystical animals: black cats, spiders, snakes, some reptiles.