Domestic Medium Hair is a coat description, not a breed. It covers mixed-ancestry cats with fur between short and long: a fuller tail, tufts between the toes and a soft undercoat, but no heavy ruff. They come in every color and pattern, and most settle at six to 14 pounds, reaching near adult size around a year and filling out by two.
Because ancestry is mixed, personality, size and health follow the cat rather than a standard. Many are adaptable, affectionate and curious, but some are shy and others bold, so meeting the cat tells you the most. In Thornton's dry climate, expect a little more brushing than a shorthair needs, particularly in spring and fall, when the undercoat lets go and loose fur collects on furniture.