Critter Nation Add-On Unit Small Animal Cage - Expands Living Space

In this review of the Critter Nation Add-On Unit small animal cage, the bottom line is simple: it is best for owners who already own a Critter Nation model 161 or 162 and need more secure, climbable living space for chinchillas, rats, guinea pigs, or other small pets. The single biggest reason to buy is the instant 36in x 25in x 24.5in expansion that integrates with an existing cage, giving pets a roomy, multi-level home without replacing the original setup. The reviewer found it thoughtfully designed for cleaning, climbing, and long-term durability.

Key Features

• Expands Living Space: Adds 36in x 25in x 24.5in of additional room to increase exercise and play area without buying a second cage.
• Full-Width Doors: Full-width double doors provide large access points so cleaning, feeding, and bonding with pets is much easier.
• Secure, Climbable Design: 0.5in horizontal wire spacing gives small animals secure footholds to climb and explore while staying safely contained.
• Comfort and Enrichment: Includes one leak-proof pan, one adjustable shelf, and two ramps with soft covers to protect sensitive feet and create varied levels for play.
• No Tools Required: Installs easily on top of compatible Critter Nation cages with a durable frame and critter-proof latches for secure use.
• Assembly Instructions Included: All setup and safety instructions are provided so owners can install the add-on correctly and safely.

Who It's For

This add-on unit is aimed at pet owners who already have a Critter Nation model 161 or 162 and want to expand usable space without replacing the whole habitat. It suits multi-pet households or single-pet owners who need extra running and climbing room, and it works well for species that enjoy vertical space such as chinchillas and rats.

People who should look elsewhere include buyers who do not already own a compatible Critter Nation cage, or those seeking a stand-in, freestanding unit with integrated base and wheels. Also, if you need an all-in-one kit with extra accessories beyond the included pan, shelf, and ramps, consider a different full package.

Pros & Cons

Pros

• High quality construction and durable wire spacing that supports climbing and long-term use.
• Spacious extension with full-width doors makes cleaning and interacting with pets straightforward.
• Includes functional interior pieces like a leak-proof pan, adjustable shelf, and soft-covered ramps for comfort.
• Tool-free installation on compatible Critter Nation cages is convenient for most owners.

Cons

• Requires an existing Critter Nation model 161 or 162 to be useful; not a standalone cage.
• Some customers report difficulty with assembly details, so expect to read the instructions thoroughly.

Specifications

Model Compatibility	Critter Nation model 161 and 162
Added Dimensions	36in x 25in x 24.5in
Wire Spacing	0.5in horizontal
Included Interior Items	1 leak-proof pan, 1 adjustable shelf, 2 ramps with soft covers
Doors	Full-width double doors for maximum access
Installation	Installs on top of existing cage; no tools required
Manufacturer Support	Family owned, customer support based in Indiana

Our Verdict

The Critter Nation Add-On Unit is a practical, well-built way to expand an existing Critter Nation habitat, offering roomy levels, easy access, and thoughtful interior pieces that increase comfort and enrichment. For owners wanting more space and secure climbing surfaces without buying a whole new cage, it is a smart value; just be prepared to follow assembly instructions carefully and ensure compatibility first.

Frequently Asked Questions

Will this unit work by itself?
The add-on is designed to connect to Critter Nation model 161 or 162 and is not intended as a standalone cage.

What is included inside the unit?
It ships with a leak-proof plastic pan, an adjustable shelf, and two ramps with soft covers to protect sensitive feet.

Is assembly difficult?
Most parts install without tools, but some customers note assembly can be fiddly; reading the provided instructions thoroughly is recommended.