我介绍我家的小狗，它的名字叫毛球，它今年3岁了。用英语怎么说

I have a dog.The dog's name is Mao Qiu.It is only 3years old.

My dog's name is MaoQiu.He is 3 years old this year.
这里的He相当与汉语中的拟人，当然也可用Its

It's named MaoQiu,it,is over 3 years old

Its name is Mao Qiu, its this year three years old.

I have a dog named Mao Qiu .It is 3 years old.