We had 4 foot fencing around our property and it worked well for all the dogs except Baron. He would go over it like a high jumper. However, having him neutered made a BIG difference on his escaping. And while our guys do dig, they don't seem to want to dig under the fence. I'm also grateful for that. Robyn Allwright Ziffany Pyrs & TMs www.picassosdog.com