YOU SAID:

my dog is taking a nap on his favorite couch

INTO JAPANESE

私の犬は彼のお気に入りのソファで昼寝をしています

BACK INTO ENGLISH

My dog is taking a nap on his favorite sofa

INTO JAPANESE

私の犬はお気に入りのソファーで昼寝をしています

BACK INTO ENGLISH

My dog takes a nap on my favorite sofa

INTO JAPANESE

私の犬は私のお気に入りのソファーで昼寝をします

BACK INTO ENGLISH

My dog takes a nap on my favorite sofa