Domestic Long Hair isn't a breed. It's the label used for a mixed-ancestry cat with a long coat, the fluffy counterpart of the Domestic Short Hair. These cats come from the general cat population, so they appear in every color and pattern, from tabby and calico to solid black and smoke. Adults usually weigh 8 to 15 pounds, and some look a lot like a Maine Coon or Persian without sharing that ancestry.
Because there's no breed standard, size, coat texture and personality vary from cat to cat. What they share is fur that needs regular brushing to prevent mats and hairballs, and the broad genetic diversity that tends to keep mixed cats healthy. In Peoria, that coat also means thinking about summer comfort and loose fur on the furniture, so plan on a good brush and a cool corner. Meeting the cat tells you far more than the label.