他害怕狗。

He is frightened of dogs.

我害怕狗。

I am afraid of dogs.

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。

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

很多人讨厌猫而喜欢狗，而有些人害怕狗而喜欢鱼。

Some people hate cats but love dogs, while some are scared of dogs but love fish.

因此，如果一个害怕狗的人多次接触狗而没有被咬伤，那么狗和疼痛的联系可能就会消失。

So if someone with a phobia of dogs had repeated exposure to the animals without being bitten, their link between dogs and pain would likely disappear.