YOU SAID:

I once ate a hot dog and thought I ate a dog

INTO JAPANESE

私はかつてホットドッグを食べ、私は犬を食べると思った

BACK INTO ENGLISH

I once ate a hot dog and I thought I'm going to eat a dog

INTO JAPANESE

私はかつてホットドッグを食べて、私は犬を食べるつもりだと思った

BACK INTO ENGLISH

I once ate a hot dog and I thought I'm going to eat a dog