Here's why:

* Diet: Dall sheep exclusively eat plants, primarily grasses, sedges, and lichens. They do not consume meat or animal products.

* Digestive System: Their digestive system is designed to break down plant matter efficiently, with a specialized rumen for fermentation. They lack the sharp teeth and digestive enzymes needed to process meat.

Therefore, based on their diet and digestive system, Dall sheep are classified as herbivores.