Povodokus, the retractable gun dog lead -or leash as people often call them, is a design concept from the clever and conceptual folks at Russian design studio, Art Lebedev.
The lead goes out freely as the dog pulls and reels in when you pull the trigger.
The Design Process
First sketches: Too much details for a leash. Simplifying: Less blasters, more real life: Choosing their top gun and preparing the model: Shooting photos for the website: all images courtesy of Art Lebedev