My little dog is only two years old.two years old划

问题补充：

My little dog is only two years old.two years old划线部分提问

答案：

How old is your little dog?

only只是个修饰词,只有两岁的意思,问句中不需要.

======以下答案可供参考======

供参考答案1:

How old is your little dog