When my neighbor bought his land, one of the first things he did was clear his side of the land on two sides and have a fence installed. It was 5 strands of barb wire. He was in a hurry to do this and in hindsight, it was a big mistake for him to move so quickly. On our line, the fence is doing fine, but where he fenced around the rest of his place, he did not clear the land and just ran it through openings that where already there. Every winter, the trees drop branches on his fence and destroy it. I've been on his place in the spring and seen close to a dozen areas where branches, or even entire trees, where laying on the fence.
We have a third line that was thick jungle. Since his fence has been so much work to constantly repair, he said that I could take out as many trees on his side of the fence as I wanted to. The more, the better. I'm working on taking everything out on both sides for at least 30 feet, with 50 being ideal. With no trees on his side, he will mow it with his batwing mower and keep it clear. He already does this on the other two lines, so it's more than worth the time and effort for me to do this.
The other mistake he made was guessing where the property line was. He went off of some landmarks, but got it wrong. Last year we had the corners marked by a surveyor now that enough trees are out of the way for them to work. At one end he was about 20 feet inside his property, at the other corner, he is closer to 50 feet inside his property. I haven't done the math, but the line is close to 1,400 feet long.
I have Dwarf Nigerian goats. As of today, I have 22 of them. Three girls are read to deliver any day, so I'll have more pretty soon. Early on, I made the mistake of installing field fence because it was cheap. My goats have horns and there is always that one who gets its head stuck in the fence. They can get there head through the wires, but the horns stop them from getting back out. It's a pain to get their horns lined up so they can get free. I'm sure that I'm going to hurt myself one of the days doing this. The only place that I did this was around my barn. I've been putting chicken wire over the fence to stop it from happening, but my baby goats are finding spots where I didn't overlap it good enough, and they are making the opening wide enough to get through. A six week old baby goat will go through the field fence like its not even there. In my case, they eat all the chicken food, which means my chickens are hungry and not laying eggs. If I used field fence around my land, I would not be able to know if one of them had gotten stuck in the fence before it died. I would not know if a baby had gotten through the fence and wandered off, or was eaten by a coyote.
Goat fence is 3x3 and more expensive than field fence. Horse fence is 2x4 and the most expensive option, but in my opinion, it's the best because it keeps any type of animal that you might have in, and keeps predators and wild hogs out. I'm installing 2x4 no climb horse fence on my place.