This is hypothetical. There is a block of houses in a street. Each house is responsible for the fence on the left side of their property. One of the houses has a dog. The owners maintain a 6 foot fence on the left side of their property, as per the rules.
However, the owners of the house next door do not. They rent the house to tenants. The fence has fallen down and has so much ivy on it that it needs a proper repair. In the meantime, the dog can just wander over to to next door.
If the dog bit one of their tenants, who would be liable? The person who owns the dog or the owners of the house who do not maintain their fence?