My GSD died while sleeping i didn't know what cause it. on March 17 my mom said that Zorro is not eating his food and vomiting his last food that he eat. and the next day he still not eating but on the night my mom give him her left over's and he's now eating a little. but on March 19 3AM when i got home i saw him lying on our front door and i can see that he was okay and he turned on me, so i go to sleep and until 5AM my mom just wake me up and said that Zorro just died and i just cant believe it. anyone know what cause it? please help.