Fences can be grown as well as built. This is a technique typically used in most developing countries. Only a rich westerner would consider building a fence around a large piece of property. Pick a non edible tree/bush that grows in your climate, plant a hedge, and wait 3 years. This may be difficult in a very cold climate unless you can find a non edible evergreen that can grow in a hedge, but there are many places in the U.S. where a living fence would be a very reasonable solution.
I love the idea of natural fences - both to keep in the critters and keep out the Riff-Raff (e.g. graffiti 'artists') even in Urban areas:

"Trials in the designing out of graffiti and flyposting have been carried out in areas where large expanses of wall/fence attract vandals. This involved the use ... planting of natural screening i.e. thorn bushes or fast growing large shrubs. The scheme is to expand during 2003 to minimise the potential for large-scale graffiti and vandalism."

http://www.bexley.gov.uk/service/environ/graffiti.html