Today when Skadi was chewing on my blanket, instead of physically moving her, which prompts a resource guarding response, or going to distract her with a treat, I tried putting her in a down stay each time she felt the urge to destroy and guard. It worked. She was able to be distracted from chewing on the blanket to listen to a command. Even when her brother Grim moved towards her when she had the blanket and prompted a growl, the down stay worked to stop her from lunging and barking at him. I was very proud of her. I think we will be working more on this command with both of them. I used a ball to reward her for holding the command. Although this object sometimes causes her to resource guard from him, sometimes causing scuffles, I think I am going to keep trying, just continuing to be very careful and cautious about letting the ball become a bone of contention between the two.
Skadi, AKA Lady Wolfington, GSD 4.6.12
Grim, AKA Bones , GSD 7.7.13