I have a question I have never left my yorkie for a long period of time except for 2 days but it was a fam member and all she did was cry as I was told and would not eat. I will be leaving to germany for 3 weeks next month. I'm not able to take my dog ( I wish I could

) but the airline doesn't let my dog travel with me as a carry on luggage so my dog will have to travel solo for 9 hrs I don't think I can do that. Since for some reason she gets scared easily, so I'm leaving her with my brother once again. My question is : Can it be true that a dog can die from sadness , she is only 2 years old and the most I've left her alone is 8 hrs which is when I go to work which she is use to since I've done it since I got her.