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。
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。
Modern times find him as a watch and guard dog as well as a family friend, guardian and protector.
现代人发现，他作为家庭伴侣与作为守护犬或警卫犬一样好。
The general purpose of the modern American Bulldog was to serve as a farm utility dog.
现代美国斗牛犬在当时是作为一种农场多用型犬种存在的。
A study of several hundred modern wolves didn't find any with the small-dog marker, he said, but it is possible there were small wolves in ancient times.
他说，对几百只现代的狼进行的一项研究未发现哪只携带有小型犬的标记，但是可能在古代曾经有过小型的狼。
A study of several hundred modern wolves didn't find any with the small-dog marker, he said, but it is possible there were small wolves in ancient times.
他说，对几百只现代的狼进行的一项研究未发现哪只携带有小型犬的标记，但是可能在古代曾经有过小型的狼。
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