Here's why:

* Anatomy: Their teeth and digestive system are designed for consuming and digesting meat. They have sharp canines for tearing and powerful jaws for crushing bones.

* Diet: In the wild, their ancestors, wolves, hunted and ate primarily meat. Domesticated German Shepherds still have a similar digestive system, meaning they need meat-based protein to thrive.

* Nutritional Needs: German Shepherds require a diet high in animal protein and fats, which they cannot obtain from plant-based sources.

While some German Shepherds might enjoy a nibble of a vegetable or fruit, their primary dietary need is meat.