Cage Sizing for Rats
One of the most important parts of proper rat care is choosing an appropriate cage!
Despite popular belief, pet rats are not arboreal, meaning they are not tree dwelling animals. They are fossorial, which means they naturally prefer horizontal space over vertical space.
Rats will climb if given the opportunity, but they can be surprisingly clumsy, especially as they age. Tall cages with excessive vertical drops can increase the risk of injury from falls.
When choosing a cage, please prioritize these two things:
1. Floor Space
Rats need adequate horizontal space for movement, enrichment, and social interaction.
According to the Canadian Council on Animal Care guidelines for laboratory rats:
1.5 square feet for the first rat
0.5 square feet for each additional rat
This is considered the minimum standard. As a pet owner, I strongly encourage providing more than the minimum whenever possible. Rats are social animals and should be housed with companions, so your cage choice must support group living.
2. Ventilation and Ammonia Dissipation
Proper airflow is critical for respiratory health.
Glass aquariums are not ideal for rats because they lack sufficient ventilation. Ammonia from urine is heavier than air and settles at the bottom of tanks, which can irritate the respiratory tract. Poor ventilation significantly increases the risk of respiratory illness.
Glass enclosures are also more sensitive to temperature and humidity fluctuations, which can make it harder for rats to regulate their body temperature comfortably.
For these reasons, well ventilated wire cages are strongly preferred.
Enrichment
While floor space is important, empty space is not.
Rats thrive in environments that feel safe and stimulating. Large, open, unenriched areas can actually feel stressful and exposed to them. They prefer cluttered environments filled with:
Hammocks
Hideouts
Tunnels
Foraging opportunities
Chew items
Shelves and platforms with safe fall distances
A thoughtfully arranged, enriched cage is far more beneficial than a large but empty one.
Providing appropriate housing is one of the foundations of responsible rat ownership. If you are ever unsure about your cage choice or setup, I am always happy to review and offer guidance before adoption.