Wouldn't it be nice to have a mood ring for your dog? You could tell when your dog wanted to go for walkies, for instance. I know it's hard to tell without something like that.
In all seriousness, Jagger & Lewis unveiled a smart collar for dogs at this year's Consumer Electronics Show in Las Vegas. Using an accelerometer and GPS, it tracks your dog and reports back to you.
This way, you can tell when your dog gets anxious or sick. Want to know if your dog acts differently around the pet sitter if you're not there? You'll be able to do it with this smart collar.
At $200, it might be a little expensive for what comes down to a doggy mood ring, though.