YOU SAID:

throw away the ball so the dog may catch it

INTO JAPANESE

犬がそれを捕まえるためにボールを捨てる

BACK INTO ENGLISH

The dog throws away the ball to catch it.

INTO JAPANESE

犬はそれをキャッチするためにボールを捨てる。

BACK INTO ENGLISH

The dog throws away the ball to catch it.