In the context of large-scale dog fostering, particularly when managing ten or more animals, the challenge of maintaining a stable social hierarchy becomes paramount. I am looking for insights into the most effective integration protocols for high-drive breeds, such as Belgian Malinois, when they are introduced into a multi-dog environment with established residents. Is there a specific observational methodology recommended to identify the early markers of "pack fatigue" or overstimulation? Furthermore, I would be interested in discussing the impact of environmental enrichment on the anxiety levels of rescue dogs transitioning from high-stress shelter environments. How do you professionally quantify the success of behavioral stabilization before a dog is deemed ready for adoption?