Here is a smart wearable device that lets you have some fun with your dog: the Disco Dog is a smartphone-controlled LED dog vest with a microprocessor, 256 RGB LEDs, and Bluetooth, allowing you to control it from your smartphone. You can display various patterns or custom scrolling text. If your dog gets too far away from you, a “lost dog” message is displayed on the vest automatically.
The Disco Dog keeps your dog visible at night and lets you customize what shows up on it. It has a rechargeable battery. You can find the project on Kickstarter.