As I mentioned in my post last night, we adopted a new rescue pup and we want to change his name to make a clean break from his past into his life with us. By changing the dogs name, you are helping him leave his bad memories behind and are now associating his new name with his new loving home.
The suggestion is to always use the old and the new names together. So you would say his old name in a soft monotone voice followed by his new name in a bit louder and more excited voice. After a few weeks you would continue on with just the new name which he should now recognize as his own. So far the change does not seem to confuse him, but only time will tell if this tactic will be successful with our particular pup.
I have high hopes.