YOU SAID:

I watched a cow eat a ear.

INTO JAPANESE

牛が耳を食べるのを見ました。

BACK INTO ENGLISH

I saw a cow eating ears.

INTO JAPANESE

牛が耳を食べているのを見ました。

BACK INTO ENGLISH

I saw a cow eating his ears.

INTO JAPANESE

牛が耳を食べているのを見ました。

BACK INTO ENGLISH

I saw a cow eating his ears.