We reinforced the collar-part by putting an iron wire around the rope
in order to make the loop where the dog has to put his head through, more stiff.
The balls in this prototype are smaller and heavier.
- The weight is important, because the ball has to stay on the ground (by gravity) when the dog bends down to grab it.
- When they are smaller, they will hinder less, when the dog is walking.
One part of the leash is fixed permanently, so it won't come off by accident.