Domestic Medium Hair is a coat description, not a breed. Shelters use it for mixed-ancestry house cats whose fur falls between short and long: fuller than a shorthair's, often with a plumed tail, tufts between the toes and a soft undercoat, but without a longhair's heavy ruff. They come in every color and pattern, from tabby and tuxedo to calico and solid black.
Because ancestry is mixed, size and personality vary from cat to cat. Most adults weigh 6 to 14 pounds, and many live well into their teens. In Killeen, the fuller coat matters in two ways: it sheds more visibly than a shorthair's, especially in spring and fall, and it holds heat in a Texas summer. Regular brushing and a cool home go a long way.