YOU SAID:

I loved my dog so much that I kissed him on the mouth

INTO JAPANESE

私は犬をとても愛していたので、口で彼にキスしました

BACK INTO ENGLISH

I loved the dog so much that I kissed him by mouth

INTO JAPANESE

犬が大好きだったので、口でキスをしました

BACK INTO ENGLISH

I loved the dog so I kissed it with my mouth

INTO JAPANESE

犬が大好きだったので、口でキスをしました

BACK INTO ENGLISH

I loved the dog so I kissed it with my mouth