A leash assembly includes a body with a handle and a cord which has an end captive
in the body. The assembly is adjustable whereby the tension in the cord can be
caused automatically to increase and decrease respectively causing a shudder in
the cord. Optionally, a noise my accompany the change in tension in the cord. The
leash will be attached in use to a collar or harness worn, for example, by a dog
and the shudder is used to assist in training the animal.