Rat Caging Your Rat Your rat's cage should be as large as you can afford and at least 12 by 24 inches. Both aquariums and wire cages can be used.
Rats prefer cages with solid instead of wire floors.
When selecting a cage, choose the type you will mind cleaning the least, because a clean cage is important. Ammonia, a by-product of urine, will damage the rat's respiratory system, so cages should never be allowed to get smelly. Cage litter is most effective for rats if you place only a thin layer on the bottom of the cage. Several manufacturers have introduced processed litter products that are ideal for rat cages. Some of these litters are made from crinkled kraft paper or processed wood pulp and fibers, while others come in pellets made from wheat grass or recycled newspaper.