Abstract: Systems and methods for training animals not to pull excessively on leads. Some systems include a tension detector, a first stimulator adapted to emit a first stimulus, a second stimulator adapted to emit a second stimulus that is different than the first stimulus, and a controller adapted to actuate the emission of the first stimulus in response to the tension in the lead exceeding a predetermined force and to actuate the emission of the second stimulus in response to the tension in the lead exceeding the predetermined force for a predetermined length of time. Some methods include detecting that a tension in the lead exceeds a predetermined force, automatically emitting the first stimulus, and if the tension in the lead exceeds the predetermined force for a predetermined length of time, automatically emitting the second stimulus.