Our small enclosure is perfect for city apartments or as a starter size. You can expand the small pen by adding one kit to make a medium pen if your pup needs more space, or multiple kits if you decide two pups are better than one! The small pen is also a great size for guinea pigs, hamsters and gerbils. The 61cm Small Lucidium Dog Pen is an oversized indoor enclosure with a drop-down bar at the door for walk-in access and clear panels. All Lucidium pens are intended for small and medium breed dogs (up to 40 lbs.), puppies, and other small animals like rabbits, guinea pigs, kittens, and ferrets. They are not designed for large dog breeds or pets that are aggressively trying to escape. Size: Height: 65cm Width x Length: 120x 60cm Approximate weight assembled: 35 lbs.