every dog has it's day中为什么要用has

every dog has it's day中为什么要用has “Every dog has it every dog has his Every dog has his every dog has his Every dog has its day. Every dog has its day Every dog has its day. Every dog has his day. Millie has a lovely dog .She ________(walk) it every day. Every dog has its day 中译如题 Every dog has its day.意思 every dog has its 如题 every dog has its day怎么翻译 every dog has its day.如何翻译 Take it easy,You know what they say,every dog has his day and you will have yours! every dog has its day.的中文意思急 every dog has his 如题,这是啥意思呢?