I can say- the electric fence is the ONLY thing that keeps my animals in! I have an 800 lb boar hog that just loooves to get out and mess up the garden- he is held in with one strand of hot wire. I tried everything- this is an animal that can snap a 2x6 for fun. Board fences, everything, hogs shred them. One hot wire about 18 inches off the ground keeps Bill in his place.
Goats? I have a large herd of milking goats- the only thing that restrains them is the hotwire. Goats can have a feeder full of feed, all the hay they can eat, and lush pasture- but they see something they want, they will get through anything to get it. My goat pasture is right along side my orchard and garden- if it wasn't for the hotwire my veggies and trees would be fair game.
Electric fence chargers really don't cost all that much. I have bought mine when they go on sale for around 50$. The posts you can put 20 feet apart so you don't need many. And I can get 2000 feet of electric tape ribbon for about 50$.
Lot less expensive than constant vet bills.
Spent a whole hour today laying in a pasture, waiting for a sparkling vampire to show up. Alas, I woke up and looked over, only to find a mound of horse crap. Sigh.