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First, though it's a little late for it to matter now, LeftyMom is right about your friend having chosen the wrong dog. Cowering at the back of the cage was a bad sign, especially in a large dog. Fear can easily lead to fearful aggression, which is especially risky in a large breed, just for reasons of strength. This dog has some kind of fear that it carries with it, and will try to protect himself. This may be difficult to impossible to overcome. (When I was on the board of a shelter, we had rules against adopting out dogs who were still spending very much time cowering at the back of runs or crates. They wouldn't be made available for adoption until this behavior was overcome.)
My first suggestion is mostly for practical reasons, but will help with training as well. Your friend needs to get a crate, where the dog can spend nights. Obviously, this protects your friend from the attacks, but it will also help the dog to feel secure. Dogs need their own space, their own den, a place that is theirs alone. This gives them a sense of safety and of ownership. The Vegan Beagle has two crates, one in my bedroom (upstairs) and one in the living room (main floor). She's almost never closed (locked) into them anymore, but they are still her favorite hanging-out places. She does go into her crates during thunderstorms (there's also one in the basement, where she is trained to go when the tornado siren sounds--even at first-Tuesday-of-the-month siren tests), so they clearly serve as a safe space for her. So, my first advice: crate training.
The crate work needs to start ASAP, for the safety of all concerned (get the best, sturdiest, crate available for a large, strong dog). Once this is in place, the next step, also to be done very soon, is to meet with a behaviorist and/or trainer. I personally would look for someone who uses positive reinforcement forms of training, rather than the "snapping the choke collar" style. This dog is already fearful, and doesn't need one more thing to be afraid of. He needs to know that he can trust your friend. So she needs to look for a trainer who doesn't use fear or punishment-based techniques. There's one trainer in this area who will actually take problem dogs out of the home, live with them during their training, and then work with the guardian before returning the dog. I have some parishioners who saved a dog from being put down in this way, and he's a great dog now.
So, I'd use the ten days (well, a good part of them) to get a crate, and get a trainer secured, then go to the vet in time to demonstrate that she's going to make great efforts to curb the dog's aggression.
As others have said, this dog has probably had a most difficult life, and is living with the results of God knows what kind of abuse, neglect, aggression. He deserves a good life, but it will take a great amount of work on your friend's part.
I wish her well!
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