a mesh or netting useful for fencing animals comprising a plurality of longitudinal wires mutually connected together in the vertical direction by weft wires , wherein the longitudinal wires as a function of their positions in the vertical direction of the mesh or netting have different strengths . the wires may be arranged in groups wherein the wires strengths vary from group to group . the differences in wire strengths may be obtained by wires having different thicknesses , iron or steel wires of different carbon contents , wires made of different materials or wires having different numbers of elementary wires .