In a manner worthy of a dog; with the courage or persistence befitting a dog.
Early 19th century; earliest use found in Examiner (London). From dog + -ful + -ly, after manfully.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。