The best enclosure for guinea pigs is a C and C cage, which stands for cubes and coroplast. C and C cages are widely recommended by guinea pig rescues, veterinarians, and experienced owners because they offer customizable sizing, excellent ventilation, and easy cleaning at a reasonable cost.

A pair of guinea pigs needs a minimum of 7.5 square feet of floor space, which translates to approximately a 2 by 4 grid C and C cage. For trios, aim for at least 10.5 square feet. Bigger is always better with guinea pigs, as more space reduces territorial disputes and encourages exercise.

C and C cages are built using wire storage cube grids zip-tied together to form walls, with a coroplast (corrugated plastic) base cut and folded to create a tray. The open-top design provides superior air circulation compared to enclosed plastic cages, which is important for preventing respiratory infections. Lids can be added if you have cats, dogs, or young children.

Avoid traditional pet store cages marketed for guinea pigs. Most are far too small, even the largest models. Aquariums and glass tanks are also unsuitable because they trap ammonia fumes and provide poor ventilation.

For bedding, you have several options. Fleece liners over absorbent pads are popular because they are reusable, comfortable, and easy to maintain with daily sweeping and weekly washing. Paper-based bedding like Carefresh works well but needs regular changing. Avoid cedar and untreated pine shavings, which emit harmful phenols.

Set up the enclosure with at least two hiding houses so each guinea pig has a retreat. Add a hay rack or hay area that allows constant access to timothy hay. Provide water bottles or heavy ceramic bowls, a food dish for pellets, and enrichment items like tunnels, bridges, and chew toys.

Place the cage in a room with stable temperatures between 65 and 75 degrees Fahrenheit, away from direct sunlight, drafts, and loud electronics. Guinea pigs are social and appreciate being in a room where the family spends time, as they enjoy observing and interacting with their humans.

Elevated cages on tables or stands are easier on your back for cleaning and keep guinea pigs at interaction height, which helps with bonding.