You've heard of those "designer purebred" dogs like the Labradoodle (Labrador mixed with a poodle)? Are they "real" purebreds? Does it matter?
Here is a site that dares you to tell the difference between some of these deliberately bred dogs and some found at local shelters. Even if you manage to get 100%, I think you'll be amazed at what you see!
Here is the quiz.
[Mine were mostly total guesses, and I got a 28%.]