Small animal cages
Small animals need escape-proof enclosures that fit how they move: wide, single-level setups with deep bedding for burrowers like hamsters and gerbils, and tall multi-level wire cages for climbers like rats, ferrets, chinchillas and sugar gliders. Size by measured floor space or volume, not by pet store kit labels, which are usually far too small.
Which cage does what
- Wire CagesMaximum airflow and climbing gridUse for climbing species like rats, chinchillas, ferrets and sugar gliders that need airflow and height. Check the bar spacing for your species.Amazon ↗
- Glass TanksDeep burrowing and visibilityUse for burrowers like gerbils, mice and hamsters that need thick bedding without scatter. A 40-gallon breeder suits gerbils and mice; hamsters need about a 75-gallon tank or larger.Amazon ↗
- Bin CagesBudget deep-bedding floor spaceA low-cost DIY option for hamsters and mice, but only if the inside floor is big enough (at least 775 sq in for a hamster), with mesh panels added for airflow. Watch for chewing on the plastic edges.Amazon ↗
- Habitrails & Modular Plastic CagesavoidColorful tiny plastic tubesAvoid. They have poor ventilation, no room for deep bedding, and far too little floor space.
Sizing: Hamsters need at least 775 sq in of continuous floor space (about 40x20 inches) with at least 6 inches of bedding. Rats need about 2 cubic feet of cage per rat in a tall cage with 1/2-inch bar spacing. Chinchillas, ferrets and sugar gliders need multi-level wire cages at least 36 to 48 inches tall.
What each animal's guide calls for
From the checklists on each care guide, so this table and those pages always agree.
- HamsterSpacious Enclosure (775+ sq in)40×20×20 in$60–$200
- Guinea pig2x4 C&C Enclosure42×28×14 in$60–$120
- FerretDouble-story multi-level wire cage · Washable fleece cage liners · Cage-mounted water bottle or lock crocks36×24×48 in$260–$470
- Sugar gliderTall Wire Cage · Enzymatic Pet Cage Cleaner24×24×36 in$162–$322
- Pet ratPowder-Coated Wire Cage · Pet-Safe Cage Cleaner30×18×24 in$130–$298
- ChinchillaTall Multi-Level Wire Cage · Fleece Cage Liners36×24×48 in$230–$450
- HedgehogLarge Solid-Bottom Cage · Fleece Cage Liners36×24×18 in$115–$240
- Gerbil40-Gallon Breeder Glass Tank with Screen Lid36×18×16 in$80–$180
- Pet mousePrimary enclosure (20+ gallon equivalent) · Secure mesh cage lid clamps30×12×12 in$56–$112
- DeguMulti-Level Metal Cage (36x24x36 in or larger)36×24×36 in$200–$300
How to choose
- 01Identify whether your species is a burrower or a climberHamsters and gerbils need uninterrupted horizontal floor space and deep bedding, while rats, chinchillas, ferrets, and sugar gliders require tall vertical climbing space.
- 02Measure the widest bar spacing on the cageMice and dwarf hamsters can slip through gaps wider than about 1/4 inch, and young rats through gaps over 1/2 inch. Syrian hamsters need 1/2 inch or less.
- 03Verify the depth of the bottom tray or baseBurrowing species need at least 6 inches of bedding, and more is better for tunnels. Shallow trays can't hold it.
- 04Check that all level platforms and floors are solidWire floors and mesh ramps cause bumblefoot (ulcerative pododermatitis) and broken limbs in small mammals.
- 05Inspect for chewing access and material safetyRabbits, chinchillas and hamsters can chew through thin plastic or swallow flaking paint.
Common mistakes
- Buying small pet store 'starter kits' that provide under 300 sq in of floor space, leading to chronic stress and stereotypic behaviors like bar chewing.
- Using wire-mesh floors or wire-grated ramps that lead to painful foot sores (bumblefoot) and caught toes.
- Housing climbing animals like rats in unventilated glass tanks, which traps toxic ammonia from urine and causes severe respiratory infections.
- Selecting cages with 0.75-inch bar spacing for female or juvenile rats, allowing them to escape or suffer head entrapment.
- Counting connected modular tubes or extra shelves toward total floor space minimums rather than measuring unbroken ground space.
Questions people ask
Why are pet store hamster cages so small?
Pet store starter cages are designed for retail convenience and low price points rather than animal welfare. Current welfare guidance calls for at least 775 sq in of continuous floor space, which starter cages rarely provide.
What bar spacing do I need for pet rats?
Use 1/2-inch bar spacing for young rats and adult females to prevent escape or entrapment. Some adult males can manage 3/4-inch spacing, but 1/2 inch is the safest choice for all ages.
Can I keep a hamster in a glass fish tank?
Yes, if it's big enough and has a full mesh top for airflow. A 40-gallon breeder (36x18 inches, about 650 sq in) is too small for a hamster; a 75-gallon tank (48x18 inches) or larger meets the 775 sq in minimum. Tanks hold deep bedding for burrowing without the mess.
Are multi-level cages good for all small animals?
No, multi-level cages benefit vertical climbers like rats, chinchillas, and ferrets, but are unsuitable for burrowers like hamsters. Hamsters have poor depth perception, risk dangerous falls from high shelves, and prioritize unbroken ground floor space over height.