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With any type of aggression issues it is impossible to know for sure what is going on by talking on the internet. So many things can be a factor in what happened that it is just not sound advice to speculate over the internet. My advice is to find a trainer in your area and have the dog temperament tested and work with them to work out any issues. since you have had the dog only a week you may not have seen the true personality and temperament of the dog. It takes dogs several weeks to get comfortable in their new environment to show their true colors and this is when a lot of problems start to happen. From my experience I would guess this behavior might get worse if not handled right away. Find a good trainer in your area and work with them.