What is the purpose of the GOOD marker in CST?

• A. To encourage the MWD between periods of getting the reward
• B. To signal immediate punishment
• C. To mark a poor response
• D. To indicate training is complete

Answer: (A)

The key idea is using a marker to clearly signal a correct behavior and keep the dog motivated while the reward is prepared. The GOOD marker acts as a positive cue that means “that was right,” bridging the moment the behavior happens and the moment the reward is delivered. This immediate, explicit signal helps the MWD understand exactly which action earned the reward, reducing confusion and sustaining focus during the brief pause before the reward arrives. It reinforces learning by maintaining momentum and enthusiasm. It isn’t used for punishment, it isn’t signaling a poor response, and it doesn’t indicate training is finished—it's simply the positive cue that supports reliable, rapid learning.