Domestic Medium Hair is a description of a coat, not a breed. Shelters use it for mixed-ancestry cats whose fur falls between short and long, usually with a fuller tail, tufts between the toes and a soft undercoat, but without a heavy ruff. They come in every color and pattern, from tabby and tuxedo to calico and solid black.
Size, personality and health vary from cat to cat. Most adults weigh 6 to 14 pounds and live 12 to 18 years, and the best guide to temperament is meeting the cat. Expect a bit more brushing than a shorthair needs, especially in spring and fall. Keeping a cat indoors is safest in West Des Moines, where traffic and coyotes are part of the picture.