YOU SAID:

My dog has lots of hair.

INTO JAPANESE

私の犬はたくさんの毛です。

BACK INTO ENGLISH

My dog is a lot of hair.

INTO JAPANESE

私の犬は、毛がたくさんです。

BACK INTO ENGLISH

My dog is too much hair.

INTO JAPANESE

私の犬は、あまりにも多くの髪です。

BACK INTO ENGLISH

My dog is too much hair.