阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

Dogs are known as "man's best friend". Owners love their dogs they are very loyal (忠诚的). Dogs may be as (small) as the Chihuahua, or as large of the Great Dane. Dogs have a very good sense of smell. Do you know that one kind of dog, the Bloodhound, is used in duck hunting? They also help policemen their work.