Domestic Long Hair isn't a breed. It's the shelter and veterinary label for a mixed-ancestry cat with a long coat, the fluffy cousin of the Domestic Short Hair. These cats come in every color and pattern, from tabby and calico to solid black or smoke, and some resemble 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. Most weigh 8 to 15 pounds, and the long fur can make them look bigger. What they share is a coat that needs regular brushing to prevent mats and hairballs. In Gaithersburg, that routine is part of the deal, whether you rent near Olde Towne or own a house in Quince Orchard.