YOU SAID:

There once was a dog that wanted to be a cat

INTO JAPANESE

昔、猫になりたかった犬がいました

BACK INTO ENGLISH

Once upon a time, there was a dog who wanted to be a cat.

INTO JAPANESE

昔々、猫になりたい犬がいました。

BACK INTO ENGLISH

Once upon a time, there was a dog who wanted to be a cat.