An electric wire run around the bottom of the fence will keep the dogs in just fine. It's what our Humane Society routinely recommends to adoptors of escape artist dogs. It's no more "dangerous" to dogs or people than is touching your tongue to a battery. You can purchase everything you need at the agricultural co-op for about $50.
I dont think a hot wire around the bottom will keep the dogs from taking a running flying leap over a 4 ft. fence. But, they do work great for diggers. All I can think of his if you can find post that fit inside the fence post or some how weld extensionsting post and just buy more 4 ft. chainlink and double up.
My neighbor just got a dog in the spring of last year. I have had a dog for the 20 years that I have lived here. I currently have a Female Golden Retriever (10 YO) and my neighbor also got a FGR. My GR is never loose, she goes out 3 or 4 times a day and is on a dog run, a 75' cable that runs from the house to a tree. My neighbor was having a problem with his pup coming on to my property and planting more 'land mines', in addition to the three or four a day that my dog planted. He has young children and they would take the dog out with them and naturally, not watch the dog after that. He had the electric 'fence' installed on his property last fall and it was installed some 10 feet from the line between his property and mine. This year, his dog would not not come within 10 feet of the electric fence, but would stand off and bark.
Don't forget the permit. Xerox your property survey, draw a mod detail showing height and get approval from the inspection department because sure as the dickens some one will complain and when you're legit they're gonna have to football a petition door to door and maybe deposition you to an arbitrator or a court to have some official tell you to lower it back down.
He could easily add some height to his fence by stringing some concertina up there. I doubt the dog would get through it. The neighbors would wonder though...
There is no practical way to increase the height of the fence. How about adding adding a wireless fence to the yard. The wireless will keep them from getting close and the chain link will stop them from running through the wireless.
neighbors G.Shepherd was climbing his and another neighbors six foot wood fence to get to a sexy smelling female mid sized mutt. He put a rope on that dog and tied it to a concrete block.... which of course followed the dog nicely into the girl friends home right through a panel in her front door. Apparently the dogs liked each other pretty well as they becoming a family.
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