Choose the dog by character, not the way it looks. Any dog needs time investment; it needs to be fed, walked, groomed, trained. Dogs hate to be alone, a couple of hours alone is ok, but basically they need humans around them. They will need medical care too, vaccinations, treatments; this can quickly get expensive. Consider getting a dog from a shelter; ask the people there for a quiet, friendly dog; don’t bother with its looks or age.