YOU SAID:
he is my best friend and he has a dog
INTO JAPANESE
彼は私の親友と、彼は犬を持っています。
BACK INTO ENGLISH
He has my best friend and his dog.
INTO JAPANESE
彼は私の親友と彼の犬。
BACK INTO ENGLISH
He's my best friend and his dog.
INTO JAPANESE
彼は私の親友と彼の犬です。
BACK INTO ENGLISH
He is my best friend and his dog.
INTO JAPANESE
彼は私の親友と彼の犬です。
BACK INTO ENGLISH
He is my best friend and his dog.
You've done this before, haven't you.