The Bigger the Better
Rabbits need cages with good ventilation. Do NOT use an aquarium or cage with all solid sides. A wire cage is a good choice, but make sure it has no sharp edges and no plastic coating for your pet to chew. Select a cage with wire spacing close enough so that it won't allow body parts to get stuck. Likewise, if you allow your pet to go in and out of the door independently at playtime, make sure the door opens to the side instead of downward, so paws won't get embedded in the wire mesh when your pet steps out. If you desire the ability to access your pet, or litter box, from the top of the cage, make sure to choose one with a door on top.
For the cage floor, you have a couple of options, both of which present challenges: a solid metal/plastic cage floor or a wire mesh bottom. Solid floors tend to trap urine and water bottle leakage, which can be absorbed into the bedding, and encouage bacteria growth and produce foul odors. Clean a cage with a solid floor frequently. A wire-mesh bottomed cage, on the other hand, can cause hock sores, so make sure you cover at least a portion with a board, rug, grass mats, cardboard or layers of newspaper if you choose this type of cage.
To provide a maximum amount of roaming space for your pet, you may want to house him in an exercise pen, similar to those used for dogs, instead of a cage. Advantages to this option are that your rabbit will have much more room, can be kept uncaged all the time, and will get more exercise. It is also less likely that your pet will suffer from the health conditions resulting from being cramped up in a small cage, such as arthritis, overgrown toenails, boredom, and depression. If you choose a pen, it is a good idea to place it in an area with easy-clean flooring like linoleum, wood, tile, or laminate. You will still need to provide a covered area, such as a crate or cardboard box, so that your pet has a place to retreat for privacy.
Some rabbits, however, can jump very high and easily scale an exercise pen, so this may not be an option for every rabbit. Even if you think your rabbit is incapable of escaping the pen, it's a good idea to place it in an area of your home that is fully "rabbit proof." This means taking measures to make sure your rabbit cannot chew or ingest electrical cords, toxic plants, carpets, furniture, etc. or that he cannot squeeze into gaps behind furniture or behind appliances.
Make it Homey
For your pet's comfort when it's time to sleep, we recommend Aspen bedding. You can also use shredded papers or other natural materials that do not contain irritating oils or preservatives. Avoid cedar or pine shavings. Don't forget to have a water bottle available all the time. If switching from a water bowl to a bottle, be sure your rabbit has learned to use the bottle before you remove the bowl. Change the water on a daily basis. Remove stale foods and provide fresh hay each day.
Locating your Cage
Locate your indoor cage out of drafts and out of direct sunlight. Rabbits like interaction with human beings, but they are startled easily. Place the cage in a peaceful area of your home that still allows you plenty of opportunities to socialize with your pet daily.
Cleaning the Cage
On a weekly basis, remove your rabbit from the cage and do a thorough cage cleaning. Take out litter pans, wash them down with hot soapy water, rinse well, allow to dry, and then refill with clean litter. Wipe down the cage sides and floor with hot soapy water and allow to dry. Periodically, use bleach water to disinfect the cage and litter pans after cleaning. Be sure to rinse thoroughly, and allow to dry before placing items back in the cage. Wash, and rinse thoroughly any toys your rabbit plays with, as well as water and food dishes/bottles. Wash ramps and other surfaces. When all surfaces are completely dry, you can place bedding, litter pans, toys, and your rabbit back in the cage.
Housing More than One Rabbit
The best rabbit housing meets your rabbit's adult size and personality needs comfortably, while providing a setting (out of direct sunlight) where your pet will feel secure and safe and allow you daily interaction. Your pet will be happier and healthier for it.