YOU SAID:

My dog is smelly he needs a bath.

INTO JAPANESE

私の犬は臭いのでお風呂が必要です。

BACK INTO ENGLISH

My dog smells so I need a bath.

INTO JAPANESE

私の犬は匂いがするのでお風呂が必要です。

BACK INTO ENGLISH

My dog smells and needs a bath.

INTO JAPANESE

私の犬は匂いがするのでお風呂が必要です。

BACK INTO ENGLISH

My dog smells and needs a bath.