Domestic Long Hair is a coat description, not a breed. Shelters and veterinarians use it for mixed-ancestry cats with medium to long fur, and these cats turn up in every color and pattern, from tabby and calico to solid black and smoke. Some look like a Maine Coon or a Persian without sharing that ancestry. Most adults weigh 8 to 15 pounds, and the fluffy coat can make them look bigger.
With no breed standard, size, coat texture and personality vary from cat to cat, so time spent with a cat tells you more than the label does. What they share is fur that needs regular brushing to prevent mats and hairballs, plus a broad genetic mix that tends to keep mixed cats healthy. In a humid Concord summer, expect steady shedding.