I would suggest working with the poor thing in baby steps. That can be a hard thing to do to any dog but especially a malamute. The dog will be very stunned for quite some time, because it puts them in a vulnerable position. It takes a lot of calm work with a dog that is used to being chained to get them back to square one. I would not expect miracles overnight as chaining creates self-protective behavior. I would really recommend training with a person who knows how to deal with malamutes and especially one that has been chained. While some people may not think chaining a dog is a bad policy, it creates reactions in the dog that are there for a long while. I did have an abused malamute who was severely beaten, starved, and chained. With lots of patience and little-by-little work with her, she became a saint. She was an excellent dog and lived to be 16 or 17 years old. It was not easy at first though as she was so confused. Mals are super smart and want to please YOU and be social so that it can be done. Even though I had trained lots of dogs, I went and did some training to get ideas from a reputable trainer who understood the breed. Then I had a place to start from - I also talked to breeders about how best to 'decondition' her when she had anxiety over things. It worked! Good luck and I'm thinking positive outcomes for your malamute. He/she needs you to reverse some behaviors that are merely coping mechanisms for them when they are put in that situation.