YOU SAID:

my dog is dying soon, then I will be sad

INTO JAPANESE

私の犬がもうすぐ死ぬ、そうしたら私は悲しくなるだろう

BACK INTO ENGLISH

my dog is going to die soon, then I'll be sad

INTO JAPANESE

私の犬はもうすぐ死ぬだろう、そうしたら私は悲しくなるだろう

BACK INTO ENGLISH

my dog is going to die soon, then I'll be sad