YOU SAID:
Hello. My dog died,so I apologize If I’m being glum..
INTO JAPANESE
こんにちは。犬が亡くなってしまったので、ごめんなさい。
BACK INTO ENGLISH
Hello. I'm sorry my dog has died.
INTO JAPANESE
犬が死んでごめんなさい
BACK INTO ENGLISH
I'm sorry my dog died.
INTO JAPANESE
犬が死んでごめんなさい
BACK INTO ENGLISH
I'm sorry my dog died.
That didn't even make that much sense in English.