But the presence of the dog there is a conditioned stimulus and so you grew to be afraid of dogs.

而这时狗的存在就变成了条件刺激,所以你开始对狗心生恐惧。

耶鲁公开课 - 心理学导论课程节选

You can make "Good dog" positive through classical conditioning.

你可以通过经典条件作用,使“好狗狗“一词变成积极刺激。

耶鲁公开课 - 心理学导论课程节选