Vick recently served eighteen months in federal prison for running a dog fighting operation in which he also killed dogs.

VOA: special.2009.08.01

for why you became afraid of dogs is that one day a dog came up and he was a neutral stimulus.

你之所以害怕狗,是因为，某天有只狗向你跑来,狗是一个中性刺激。

耶鲁公开课 - 心理学导论课程节选

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

She and about one hundred other dogs were rescued from a dog sled operation in Quebec,Canada.

VOA: special.2009.12.11

Dogs are judged against a description of the perfect dog for each kind or breed.

VOA: special.2009.02.23