interesting facts - male, GSD , black, born new year's eve , 8 months.
Important facts - dog not able to hold down food and water
this is pretty serious . No matter what you need to go to the vet.
you said this has been a recent change ? how long has this gone on?
is the food spoiled with mold ? what is the food.
does the dog get treats -- does the dog get raw hide chews.
has the dog eaten some foreign object - a sock , a toy , chunks
of recreational bone -
baby in the house? a diaper --- not far fetched - dogs can get
themselves into trouble in all sorts of ways
get the dog to the vet --- you may be dealing with a blockage --