"To build a fence" means to construct a barrier made of wood, metal, or other materials to separate and enclose an area, usually for privacy, security, or to keep something or someone within a specific boundary. Full definition
I hope you don't chew them out for not building a fence around the pool before you got there. (religion.blogs.cnn.com)
I actually built my fence for my last dog that died of old age. (thatmutt.com)
Municipal by - laws create a wide range of offences, from building a fence too high to keeping too many dogs or making excessive noise. (ontariocourts.ca)