There are so many dog breeds that exist in the world.

世界上狗的品种繁多。

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But dog breeds differ in more than their outward appearances.

但不同品种的狗在超过其外表。

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Check out this example below, a Square for the search "dog breeds."

以下是一个用Squared搜索“犬种(dog breeds)”的例子。

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The AKC recognizes dog breeds in the United States.

VOA: special.2009.02.23

"Most dog breeds have really only been around since Victorian times, " said Elaine Ostrander of the National Human Genome Research Institute's Dog Genome Project.

WSJ: Breeders of Rare Woolly Pooch

Of particular interest are canine remains that resemble one of the oldest known domesticated dog breeds, the desert saluki, as well as traces of a dagger.

BBC: Desert finds challenge horse taming ideas

According to researchers, while many modern pets may look like those depicted in ancient Egyptian tombs or Roman mosaics, extensive cross-breeding through thousands of years has meant that no modern dog breeds can be truly classified as "ancient".

BBC: Modern dogs have 'little in common' with ancient breeds