DD, I think you hit it right on the nose! Er...the beak!
I feel your pain, obc--ours are very good at a lot of things...like not jumping up or leaving things alone...until either a guest gets brave enough to venture into the house or the Pack is out in the yard watching squirrels.
But as DD also says, sometimes a dog just has to be a dog. I'm satisfied if mine keep all the embarrassing stuff to the backyard out of sight of the public!