YOU SAID:

my dog is a pain in my side

INTO JAPANESE

私の犬は私の側の苦痛である

BACK INTO ENGLISH

my dog is a pain on my side

INTO JAPANESE

私の犬は私の側の苦痛だ

BACK INTO ENGLISH

My dog is a pain on my side.

INTO JAPANESE

私の犬は私の側が痛い。

BACK INTO ENGLISH

My dog hurts on my side.

INTO JAPANESE

私の犬は私の側で痛い。

BACK INTO ENGLISH

My dog hurts on my side.