YOU SAID:

my dog is so lonely in his house

INTO JAPANESE

私の犬は彼の家でとても寂しい

BACK INTO ENGLISH

My dog is very lonely at his house.

INTO JAPANESE

私の犬は家でとても寂しい。

BACK INTO ENGLISH

My dog is very lonely at home.

INTO JAPANESE

私の犬は家でとても寂しい。

BACK INTO ENGLISH

My dog is very lonely at home.