I cant get him back to his mother. Do you think he won't live ?Don't worry. That snout will grow Cute pup! Keep looking at pictures of the pup the next few weeks, you will see a lot of changing. Where is the Mama? The little thing should be with her.
There are forum members that have raised motherless puppies before on here. I hope they chime in. If you follow their advice, he should make it though it ok. I believe the member SELTZER may be of help to you. There are so many things you need to be doing to help him right now. I don't want to tell you the wrong stuff.
I am from Lebanon. I am not feeding him cows milk but all my friends raised their gsd feeding them cow milk. That really confused me. And they tell me to feed him full fat cow milk .Do no feed him cows milk. Make a puppy formula or use goats milk. As others said should be with his mother and littermates several more weeks. Where are you located?