YOU SAID:

I went to the store with my dog to buy a carton of milk

INTO JAPANESE

私は犬と一緒に店に行き、牛乳の箱を買いました

BACK INTO ENGLISH

I went to the store with my dog and bought a milk box

INTO JAPANESE

犬と一緒に店に行って牛乳箱を買った

BACK INTO ENGLISH

I went to the store with my dog and bought a milk box