That's not at all what this post was intended for. And no one said other dogs were dumb. In fact many of us pointed out that there are BCs who are hard to train. But you can't argue with facts. The Border Collie is the world's most intelligent breed, you can check any studies in the world and they are all conclusive. 10 year olds can't be expected to handle a Border Collie well. BCs need more experienced handlers and a child is bound to have issues training one. Nonetheless, indeed mixes are very intelligent(sometimes, lol!). I've never met a truly "dumb" BC, but many hard to train BCs. I've met dumb mixes and very smart mixes. Intelligence comes in all shapes and sizes. This post was not intended to knock other breeds. So please don't knock ours.