YOU SAID:

the dog eats the cat and the cat eats the mouse

INTO JAPANESE

犬が猫を食べる猫がマウスを食べる

BACK INTO ENGLISH

A dog eats a cat A cat eats a mouse

INTO JAPANESE

犬は猫を食べる猫はマウスを食べる

BACK INTO ENGLISH

A dog eats a cat A cat eats a mouse