YOU SAID:
The cat is eating cat
INTO JAPANESE
猫は猫を食べています
BACK INTO ENGLISH
The cat is eating a cat.
INTO JAPANESE
猫は猫を食べている。
BACK INTO ENGLISH
The cat is eating the cat.
INTO JAPANESE
猫は猫を食べている。
BACK INTO ENGLISH
The cat is eating the cat.
That didn't even make that much sense in English.