The Tangle Free Dual Dog Leash is a handy one if you've got two dogs, since it will help prevent you from getting yourself in a rather cartoonish bind, as some animated characters seem to do when walking multiple dogs.
The pet leash is designed with retractable twin leads that emerge from a durable plastic reel through separate openings. What makes the leash so handy is that the reel is capable of rotating a full 360 degrees, so no matter how much the dogs decide to run around in circles, there are no tangles created. Additionally, the device is ideal because it leaves your other hand completely free to do or carry other things. The leads are designed for dogs up to 30 lbs and comes in at about $50 on Fancy.