We have a 4' woodenfence, but it was there when we moved in. I would have liked a 6' privacy fence b/c Bonnie and Dolly can dig right out. We have to keep a close eye on the. One time, when we first moved into our new home we were sanding and spacking getting ready to paint our new bedroom. While we were working we forgot the puppies were outside. They happened to dig out. We went searching for them everywere, for four hours. They were gone for about 5 hours in the rain and 5 miles away from our house. How awful. Belive it or not, Bonnie and Dolly stayed together the whole time thank goodness.