Our GSD has become obsessed with watching reflections and chasing shadows. She can be distracted by it momentarily, but then goes right back to the behavior. Anyone else ever experienced this? Any advice on ways to break this behavior?
This sounds like a real mental health issue that you will likely need help addressing by a trainer, vet or behavioralist. Or all three. I agree on the laser pointer as well. This seems to be a common side effect of that popular "toy".