YOU SAID:

I ate my horse but not my cow

INTO JAPANESE

私の馬がいない私の牛を食べた

BACK INTO ENGLISH

I don't have my horse cow ate

INTO JAPANESE

馬牛を持っていない食べた

BACK INTO ENGLISH

Did not have horse cattle ate

INTO JAPANESE

牛を食べた馬はありませんでした。

BACK INTO ENGLISH

The horse ate the beef.

INTO JAPANESE

馬は、牛肉を食べた。

BACK INTO ENGLISH

The horse ate beef.

INTO JAPANESE

馬は、牛肉を食べた。

BACK INTO ENGLISH

The horse ate beef.