P.S. It's the herding problem that is at the back of my mind looking at rescue dogs. Round here are lowland sheep who can be guaranteed to do the most stupid thing possible when confronted by a herding dog, and farmers understandably will sometimes shoot without question a dog that puts their herd at risk. I've heard that the only chance of teaching a herding breed to be uninterested in sheep is to teach them that very young, and repeat, and repeat. You cannot always avoid sheep because they change pastures. Sure it's in a collie's nature to herd, but we are in the 21st century so perhaps they need to learn to use smartphones? I am hopeful can discourage this.