I would like to get everyones ideas about these. After seeing my old neighbors Golden constanly out of his yard even though he had underground fencing- I was not convinced these work well. BUT wondering if they have improved. I really need something to put my mind at ease after I lost a dog several months ago. She got out of the inside run (my son forgot to put the clip in the hasp the night before) and opened a window to the kennel building somehow and pushed out the screen- 15 minutes after I had been there to water and play with the dogs I found her on the road when I left to take another dog to the vet. The other dogs never even barked- maybe because they were outside and didn't see her escape and she never went around to the outside run area- just through the post and board fence (she broke a board going through it)-across the neighbors field to the highway? I am still very upset about her passing and am blaming myself for not extending her house time as she had just gone back to the kennel the night before with a few others so the next group could have house time. She was such a sweet and lovely girl with national winners in her pedigree. I don't even have a son or daughter from her as I was waiting to breed her until after she got her hip xrays and thyroid test (if they were normal) and she matured some more. Since then I find myself jumping up if I hear anything and constantly checking to be sure no one is out. I am so stressed about it, I do not sleep more than a few hours at a time. I thought I had a secure set up - kennel building with attached runs- gates (which have clips on the latches) open up into a large gated exercise area, which I lock. Perimeter fences are all 6 ft. The windows are the narrowest I could find that would still allow good air flow when opened (with screens). The inside runs are cattle wire with hasps so keep them closed, and clips on those- they empty into an aisle- the door has a hasp on the outside. Not sure what else I could do to make it more secure other than iron bars on the windows (which I am strongly considering). Now thinking about underground fence. Would underground fencing be a good option for yet another barrier? What has been everyone's experience with it? Will it cause my dogs to become fearful? What strength would I need for collies? Can they be used on pups? Any suggestions and experiences? I had considered electric fencing, but I am not thrilled with that idea as I have been shocked by it before- it is really strong, I would think it could kill a pup and I could see myself brushing against it too.