Hello,
It's my first time here.
I have the same problem with my boxer/mix duke. He was abandoned at my house by a previous renter. I fell in love with this crazy guy
he is such a terrific k9 that I cannot understand why someone can leave him behind.
The whole anxiety issue sounds about right with him. The only time he jumped the 6ft fence in front of me, was when my attention was focused on my other 2 boys. When I leave the backyard is when he starts flying over those fences. I'm afraid that he will get hit by a car. He has already been picked up by the pound once. I have a nice roomy dog run but that doesn't seem to stop him. the only idea I came up with is to put a sturdy fence as a roof. for now I have to tie him up on a long leash when im not around to watch him. it sucks! but it is better then getting hit by a car.