A choke leash is most used leash with assistant dogs.
It is simple, and contrary to what many think, totally safe.
When the dog pulls to hard, the loop becomes smaller, and so he will walk slower.
Some choke leashes contain a safety knot or piece of leather to prevent that the loop becomes
too big/loose so the dog stumbles. (you can see that element on the second picture)
This benchmark can be usefull for our project, because it is simple and not expensive.
It is an inspiration for designs where the leash and collar form one whole.
choke leash without safety element
choke leash with safety element