Annoying Doggie

After the ugly dog story, this seemed like a natural followup:

A robot dog that monitors your daily food intake and exercise levels and warns you not to eat that cheesecake could encourage people to stick to their diets.

If you have stuck to your daily calories, he will jump up and down, wag his tail, play vibrant music and flash the brightly coloured LEDs that pepper his 50 centimetre-tall plastic body. But if you have already had too many, he will move slowly and lethargically and play low-energy music.

Why don't they do something useful and work on a genetically engineered cat that empties its own cat box.