YOU SAID:

The dog farted and got scared

INTO JAPANESE

犬はおならして怖がった

BACK INTO ENGLISH

The dog was fart and scared

INTO JAPANESE

犬はおならと怖かった

BACK INTO ENGLISH

The dog was scared with a fart

INTO JAPANESE

犬はおならで怖がっていました

BACK INTO ENGLISH

The dog was scared with a fart