How can I properly care for my old GSD to ensure their health and well-being in their senior years?

To properly care for your old German Shepherd Dog (GSD) in their senior years, provide regular veterinary check-ups, a balanced diet tailored to their age and health needs, daily exercise appropriate for their mobility level, mental stimulation, comfortable sleeping areas, and a safe environment to prevent accidents. Additionally, monitor their weight, manage any chronic health conditions, and give them plenty of love and attention to ensure their overall well-being.