All interior kennels are heated and air-conditioned. They range in size from 9 square feet, for small dogs, to over 20 square feet for larger breeds or families with more than one dog. No sharing for pets who do not live together. Most of the pens are design for privacy and open into an aisle, rather than facing other dogs across a room. The walls between these compartments are solid to the ceiling, so the dogs cannot see, or be seen by each other. This is a great comfort for shy pets, which like to take their time to get acquainted. These compartments open to a connecting outdoor run. We normally allow dogs 24- hour access to their private run.