I have 2 dogs that can easily escape. They are never left out side without supervision and even then it's no longer than 5 minutes. (Unless I'm cutting the grass etc...) It would be irresponsible of me to leave my dogs in the yard unattended KNOWING that they can (and will) escape. It was a bit of a lifestyle change for me, the dog we had previous to that was not any bully breed and in all the years we had her she never once tried to go over, under, or through the fence. She was 100% content to stay in the yard all day every day. You are going to need to change your yard, try what you must but don't try it long enough that they get out time after time, just long enough to know if it's effective. I changed my life to go out there with them EVERY single time they need to go out, and stay with them until I say it's time to come in. I didnt pay a penny for that change and I now know exactly what's going on with my dogs now inside and out all the time. It's also a good way to make sure that no one has chucked anything bad or poisinous over the fence. Not that it's happened but I like the piece of mind. I have one dog that HATES loud noises so when the neighbour was siding his house next door this summer the only way I could keep him under control was on a chain. He would jump out of the yard, so I put him in a crate outside in a 6 sided kennel inside the yard and it wasn't a minute and a half till he was out on the street again. As soon as he was chained he layed there and relaxed. Chaining in my weather is not an option, but it is for him temporarily in that situation and will be again if need be. I should add that I have 6 and 7 foot chainlink and wood plank fence and the two that can get out can escape that and more. Lily can climb chainlink as high as it will go, and Harlem can jump over a 9 foot plank fence. My other dogs have not tried to escape, however they've never been left in the yard unattended long enough to get bored to the point of trying it. I have no doubt that every dog and foster I have has the ability to escape if given the right amount of time.