That looks like normal dog fence and you barbwire the top for cattle. It costs a lot so after spending that money it's normal [1] to put barbed wire on top. Th

That looks like normal dog fence and you barbwire the top for cattle. It costs a lot so after spending that money it's normal [1] to put barbed wire on top. The 'dog' refers to the smaller spacing at the bottom. [1] By normal that's what I've seen. Can't confirm it's more than 50%. You might not do it for internal fencing. - Picture of a bespoke cow with barb and dog fence - https://www.flickr.com/photos/ratters1968/16377626013 https://www.flickr.com/photos/ratters1968/16377626013 We don't barbwire ours because we have (miniature) goats.