Domestic Long Hair isn't a breed. It's the label for a mixed-ancestry cat with a medium to long coat, and these cats turn up in every color and pattern, from tabby and calico to smoke and solid black. Adults usually weigh 8 to 15 pounds, though the fluff can make a cat look bigger than it is.
Because there's no breed standard, no two are quite alike. What they tend to share is a coat that mats and sheds without regular brushing, plus the general health benefits of a varied gene pool. In San Bernardino's dry heat, that coat is the main thing to plan around, so spend time with a cat before deciding whether its energy, size and coat fit your home.