Aggression!

[howl4metok]

The terms of his adoption include no other pets and no children. And I can separate him from the pack here. My biggest concern is overall, he does it even to us. If we have food in our hands he snatches it, and nothing we do to try and stop him has much effect.
I'm worried that placing him at all is a risk, if someone has small guests that get in his way, or even if someone sits down to drink or eat something and get clipped by a tooth when he snaps it away.
Even today I was working with him alone. He's learning sit. He decided he didn't want to sit, so I pressed gently on his rump to try and show him what I wanted. He growled. He didn't want to budge, he refuses to submit at all. I tried enforcing some dominance, but everything I tried just made him growl again.
I put him in a "time-out" kennel. Now I find myself always being weary of him, and I only handle him in the few ways that allow me to keep my face away from his reach. I just don't know when to expect another surprise out of him.
Maybe just back off a bit on basic training and stick to the much more subtle You're-not-in-charge-I-am training. He just doesn't seem to be responding well to anything.

[Glacier]

From your description, I'd guess that you have a dog on your hands who has previously been allowed to do whatever he wanted, whenever he wanted. He's never been taught that he has to respect humans. That's the first thing he needs to learn! I'd put him on an immediate Nothing In Life is Free program. He works for everything--food, attention, walks ect.

Personally, I don't mind a dog that growls at me. I'd much rather have a dog that warns me than one that just bites. If he had wanted to, when you were trying to force him to sit, he could have put you in the hospital. It's a great sign that he didn't do anything more than growl.

If you are truly afraid of him, he may be better off in a different foster home. I'm not saying that to be rude in any way. I gave up one of my fosters because I didn't trust Summit. I didn't trust her, she scared me and because of that, I couldnt' work with her and give her what she needed. Summit had issues similar to what you've described. I gave her up after she tried to kill my Kayleigh. Summit is now happily in her forever home.