I am interested in the answers to this question as well. I would like to put up some fencing for keeping a dog in (our last dear obedient dog was killed on the highway even though he knew not to leave without us. He mistakenly followed my mother down the road on her bike and was hit:()
Deer pressure is also a major concern from every direction. I do things to mitigate the deer, but the population is so large that I think only a fence will really keep them out. I know they are part of the ecological system but i is a system way out of balance and our farm is too small to solve that.
Putting up a fence is building an edge, however, and so I haven't done it yet because keeping it clear will be such a challenge. Invasives are a big big issue here. I have had the thought of planting things along the fence, but even that will need a lot of attention, and I don't have time for more work. It makes the fence seem like not a
permaculture solution since it won't take care of itself.