Khita, our 5 year old female Alaskan Malamute/German Shepard got ahold of my daughters guinea pig and crushed and bloodied it to the point we had to put it down. Now she’s more desperate to get into that room where the other pig is and she is a little more aggressive in general. She’s a rescue that was returned to the shelter twice because she’s energetic and anxious. We’ve had her two years. I need advise on what to do. Do I get her training? Is she still trainable at age 5? Will aggression be helped with training. She was a difficult dog to begin with but we love her and have been happy to provide her with a good, stable home.