A bark control system for training a pet dog not to bark. The bark control system includes a vibration sensor and a microphone either operating independently or in tandem with the vibration sensor gating the microphone. The output of the vibration sensor and the microphone are processed to discriminate the target dog's bark from other noises. When the discrimination result indicates that the sound is a bark, a stimulus delivery device applies a corrective stimulus. To improve bark discrimination, a memory device stores an exemplary bark for comparison. Each bark sampled replaces the bark previously stored permitting the bark control system to adapt to any repetitive bark sequence of the target dog. Finally, a stimulus intensity selection circuit provides variable intensity corrective stimulus.