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Small Animals See a Fence Differently
A fence that looks perfectly solid to you can look like an open door to a rabbit or a chicken. Small animals do not experience barriers the way we do. They look for gaps, test openings with their noses, and squeeze through spaces that seem impossibly narrow. If you have ever watched a young rabbit flatten its body and slip through a hole barely wider than a coin, you understand the problem. The right fence netting is not just about building something that stands up. It is about choosing a mesh size that matches the specific animal you are trying to contain.
What the Numbers Actually Mean
Mesh size refers to the distance between adjacent wires in the netting, measured either from center to center or as the clear opening. For small animal containment, the clear opening is the number that matters most. If that opening is larger than the animal's skull or ribcage, the fence is basically a suggestion rather than a barrier. A full grown chicken can typically squeeze through anything larger than about 50 millimeters. Rabbits, especially smaller breeds, can get through openings as tight as 30 millimeters. Young poultry and chicks need even smaller gaps, often 15 to 25 millimeters, because their bodies are still small enough to slip through what looks like a tiny hole.
Matching the Mesh to the Animal
Different animals need different mesh sizes, and getting this wrong defeats the purpose of building the fence in the first place. For adult chickens and larger poultry, a mesh size of 25 to 50 millimeters generally does the job. For rabbits, the recommendation drops to 30 millimeters or smaller, because rabbits are surprisingly good at compressing their bodies. If you are protecting against predators like foxes or small dogs digging into a chicken run, the mesh needs to be tight enough that a paw cannot reach through and grab a bird. In those situations, a 25 millimeter or even a 15 millimeter mesh provides real security. The smaller the animal, the tighter the mesh needs to be, and there is no single number that works for everything.
Hexagonal Versus Rectangular Openings
The shape of the mesh openings matters almost as much as the size. Hexagonal netting, often called chicken wire, is common and inexpensive. It works fine for adult poultry in low risk areas. But hexagonal openings can distort over time, creating larger gaps at the points where the wire twists. Welded wire fence netting with rectangular or square openings holds its shape better and provides more consistent protection. For small animals that are persistent escape artists, welded mesh with uniform openings is usually the safer bet. The wire gauge also plays a role. Thinner wire can be bent or chewed through by determined animals, so a heavier gauge adds an extra layer of security on top of the correct mesh size.
Thinking About What Is Outside Too
Containment is only half the equation. The fence netting also needs to keep predators out. A mesh that holds your chickens inside but lets a weasel walk right through is not doing its full job. Weasels, stoats, and rats can slip through openings as small as 15 millimeters, which is tighter than most standard poultry netting. If you live in an area with active predator populations, the mesh size should be chosen with both the contained animals and the local wildlife in mind. Overlapping panels or burying the mesh below ground level adds protection against animals that dig, which is a separate but equally important consideration.
When in Doubt, Go Tighter
The safest approach when choosing fence netting for small animals is to go one size tighter than you think you need. Mesh that is slightly too small costs a bit more and takes a bit longer to install, but it does its job. Mesh that is slightly too large leaves you with escapees, injuries, or worse. For most backyard setups with a mix of chickens, ducks, and rabbits, a welded wire mesh with 25 millimeter by 25 millimeter openings is a solid all around choice. For breeding operations with young animals or areas with high predator pressure, stepping down to 15 millimeter by 15 millimeter is a worthwhile investment in peace of mind.