What was the primary utilitarian reason for the stiff, wiry coat and distinct facial furnishings?

Answer

Guarding the dog’s sensitive facial skin while working

The wiry coat and beard were essential protective gear, guarding the dog’s sensitive facial skin while it worked underground or among barn vermin.

What was the primary utilitarian reason for the stiff, wiry coat and distinct facial furnishings?
OriginDogbreedSchnauzer