Our Red Bone Coon hound had separation anxiety. We were the 5th family to adopt him from the local pound. His origianl owner had left there-twice!
He ran all over the house as we left, tore down gates, blinds, etc.
Funny thing was that when we walked him out to the dog house outside and put him on a 15 ft chain in the shade with water and food, he would walk over to it lie down and look at me like he was saying. "don't you have a place to go?"
He didn't like being left alone, but worse was not being out. He didn't want to "feel" confined. He's gone now. I miss him still. He was a character otherwise.
Good Luck! They still make good pets, sometimes need the extra time you have to spend to help them.