Finding weird pet-related technology is a CES tradition, and this year is no exception. Take Flappie, for example. The Swiss start-up is showing off an AI-powered cat door that automatically locks if your kitty tries to bring in prey it caught from the outside.On the side of the door facing the outside, you'll find a motion sensor and night-vision camera. Flappie says it has compiled a "unique and proprietary" dataset over the years, with a focus on diversity — this means getting lots of differe...