Modern dog breeds are part of a unique population structure, having been selectively bred for many years.

现代犬种是一个独特的种群结构的一部分，是经过多年人工选择育成的。

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The first modern conformation dog show was held in Newcastle-upon-Tyne, England in 1859.

第一次的现代形态比赛于1859年举行于英格兰纽卡斯尔泰恩。

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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

The film is said to involve a new boy, a "snow dog" and such modern landmarks as the London Eye.

BBC: Snowman producer John Coates dies