I tried to start a flock once, bought 3 ewelambs and a ramlamb, and put them in an Electronet fence during the day. It kept the lambs in. But, a stray dog spooked the lambs. One got tangled in the net. Whether she died from heart attack caused by fright it by electrocution, I don't know.
My advice is don't depend on flexible net, even electrical. Build a good fence first. Use field wire with a 4"x4" opening, 4' high. I found non-standard rolls at a scrap metal dealer in Ada OK selling the wire by the pound. It came out to about 1/3 the retail price.