Maybe I’m missing something, but wouldn’t any savings on fencing be wiped out by the manhours it would take to retrieve animals who wander onto others’ properties?
On people they would be akin to something in the short story, 'Harrison Bergeron.
In the year 2081, the 211th, 212th, and 213th amendments to the Constitution dictate that all Americans are fully equal and not allowed to be smarter, better-looking, or more physically able than anyone else. The Handicapper General's agents enforce the equality laws, forcing citizens to wear "handicaps": masks for those who are too beautiful, loud radios that disrupt thoughts inside the ears of intelligent people, and heavy weights for the strong or athletic.
https://en.wikipedia.org/wiki/Harrison_Bergeron