YOU SAID:

I went to the store with my big red dog

INTO JAPANESE

私は大きな赤い犬と一緒に店に行きました

BACK INTO ENGLISH

I went to the store with a big red dog.

INTO JAPANESE

私は大きな赤い犬と一緒に店に行きました。

BACK INTO ENGLISH

I went to the store with a big red dog.