Young Blonde Girl Outside Near The Wooden Fence

United Kingdom
Ownership of the fence varies. In some parts of the country all boundaries are shared; in other parts of the country you may own the boundary on the left-hand or right-hand side, however, only the title deeds can be depended on to tell you which side is yours. (A 'T' symbol indicates who is the owner). It used to be normal for the cladding to be on the non-owners side (enabling access to the posts for the owner when repairs need doing), but increasingly this cannot be depended on.
Where a fence or hedge has an adjacent ditch, the ditch is normally in the same ownership as the hedge or fence, with the ownership boundary being the edge of the ditch furthest from the fence or hedge. The principle of the rule is that an owner digging a boundary ditch will normally dig it up to the very edge of their land, and must then pile the spoil on their own side of the ditch to avoid trespassing on their neighbour. They may then erect a fence or hedge on the spoil, leaving the ditch on its far side. Exceptions often occur, for example where a plot of land derives from subdivision of a larger one along the centre line of a previously existing ditch or other feature.
On private land in the United Kingdom, it is the landowner's responsibility to fence their livestock in. Conversely, for common land, it is the surrounding landowners' responsibility to fence the common's livestock out.