I agree with Willy and Flyaway. I only have a three foot fence in the front yard and my dog has NEVER tested it. He could easily jump it, but doesn't find the need to. He likes to be around his family and we take him lots of places, which satisfies his need to roam. I also agree with Willy about the boundaries thing. GSDs have a crazy understanding about boundaries. My dog knows exactly where my property line ends-even when we lives in places that didn't have a front fence, he knew exactly where to stop.
Whenever we moved to a new place, he'd spend a while sniffing along the whole boundary.
edit: I want to add that I've fostered over a dozen dogs and I've just trained them to stay away from the gate (the easiest place to get out). Every time they get close, I would say eh eh, and reward them for staying away from it.
ADCH Mikko (USDAA) SCH-B; (NADAC) EAC, EJC, TN-E, TG-E, VerO; (AKC) NAJ, CGC; (NACSW) NW1 - 9 year old GSD
Last edited by I_LOVE_MY_MIKKO; 12-13-2012 at 04:30 PM.