Rollo is a dog collar with an integrated, retractable leash mechanism.
To aim of this design is to give more freedom to the dog and his owners by
changing the traditional two-part leash/collar into a more efficient one-part system.
This system can be usefull for us because it immediately solves the problem
of locking the leash to the collar. The new challenge is put on the collar. Or if the collar is permanently on the dog, to reach the handle of the leash and offer it to the owner.
Rollo: The leash is integrated in the collar.