This patent discloses a system to train a dog to reduce barking while the dog is kept in an outdoor dog pen. The system may include a bark switch connected between a transformer and a power supply, a water valve operatively connected to the transformer and connected between a supply hose and a spray hose, a water supply connected to the supply hose, and a sprinkler head connected to the spray hose. Those components that may freeze may be located in a heated building. If the bark switch receives a bark of a predetermined intensity, the bark switch allows the power supply to send power to open the water valve so that water sprays a predetermined area of the dog pen. A timer may shut off the water spray and a lack of bark from the dog may keep the water spray from being turned on again.