They say dog is man's best friend.

人说，狗是人类最好的朋友。

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You would say that we'll take the dog to the vet, and end the dog's life.

你会说我们将把狗送到兽医那里，结束它的生命。

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To describe a person's serious illness, they say "sick as a dog".

为了形容一个人的严重疾病，他们说“病得像条狗一样”。

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"I don't know anybody could be such a hound dog not to want to say good-bye,"

VOA: special.2009.11.14

So, the claim about a phobia is that there's a bad association between, say dog and fear, or between airplanes or snakes and some bad response.

比如说，恐惧症就是在狗和恐惧之间,或是在飞机，蛇和一些糟糕反应之间，存在着消极的联结。

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You would say we'll take the dog to the vet, and end the dog's life.

你会把狗送到兽医那里，然后结束它的生命。

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When you consider it, dog ears are really quite charming, unlike say, dog noses or dog bellies.

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And, you know, the neighbor may say the dog was unprovoked, but I want the dog's side of the story.

NPR: The Ethicist: Weighing a Canine Conundrum

They say every dog has its day and on a sunny afternoon in West Hollywood, Belle has hers, as Quest takes her for a grooming and spot of shopping.

CNN: Quest for man's best friend