YOU SAID:

My dog likes to sleep on his back

INTO JAPANESE

私の犬は背中に寝るのが好きです

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My dog ​​likes sleeping on her back

INTO JAPANESE

私の犬は彼女の背中に寝るのが好きです

BACK INTO ENGLISH

My dog ​​likes to sleep on her back

INTO JAPANESE

私の犬は彼女の背中で寝るのが好きです

BACK INTO ENGLISH

My dog ​​likes to sleep on her back