求翻译：以前狗主要分为三类：一是田犬，是专门用来狩猎的；二是吠犬，主要是用来看家护院的；三是食犬，主要用于人类食用。但随着人类社会的进步，对狗的驯化水平也不断提高，人们更多把注意力放到对狗的潜能作用的开发利用上，狗的用途由此发生改变。军犬、警犬、搜救犬、观赏犬等等，是什么意思？

The dog is mainly divided into three categories: First, Tian dogs, is dedicated to hunting; two barking dogs, mainly used for home-care hospital; eat dogs, mainly for human consumption. But with the progress of human society, the domestication of the dog level, continuous improvement, more focus on

Previous dog divided into 3 major categories: The first is tin dog hunting, that is specifically designed to be used in the Vedas; 2 is a dog, it is mainly used for home care homes; 3 is a dog that is mainly used for human consumption. However, as the progress of human society, and the domestication

正在翻译，请等待...

Previous dog fall into three main categories: one is the Tin dog, was designed for hunting; second, barking dogs, are mainly used to watching protect a yard; three are eating dogs, mainly for human consumption. But with the progress of human society, the domestication of dogs is also improving, more

正在翻译，请等待...