YOU SAID:

Dogs always fight with big cats.

INTO JAPANESE

犬はいつも大きな猫と戦う。

BACK INTO ENGLISH

A dog always fights a big cat.

INTO JAPANESE

猫、ずいぶん大きい猫だな

BACK INTO ENGLISH

Cat. It's a big cat.

INTO JAPANESE

猫、ずいぶん大きい猫だな

BACK INTO ENGLISH

Cat. It's a big cat.