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Health Issues That Affect German Shepherd Life Expectancy German Shepherds reach their peak between the ages of 2 and 6. They are at their best in terms of physical fitness and mental sharpness. Their size makes them at a higher risk of developing cancer muscle and joint issues, and other health conditions that may have a negative impact on their lives. Working line German Shepherds often have more active lives than their show line counterparts. They require a nutritious diet to help them meet their hig