A leash assembly for training dogs includes a handle and an elongate strap connected at one end to the handle, the other end being adapted to be connected to a collar worn by the dog. An elastic element has a first length when in a relaxed state and is extensible four inches to a second length when fully extended. The elastic element is attached to the strap with the length of strap between attached ends of the elastic element being substantially equal to the second length. The force required to reach the fully extended state is about 5 pounds or 2.3 kilograms. The elastic element significantly limits the impact of strong, short correctional tugs or jerks on the leash by the trainer.