What is the name for a dog’s snout area including nose and mouth?

The story behind the answer

Muzzle is the correct term for the protruding part of a dog’s face that includes the nose, mouth, and upper and lower jaws. “Nose” refers only to the nasal organ, and “jaw” to the bones and muscles used for biting and chewing. “Rostrum” is a broader anatomical term used in comparative zoology and skull anatomy, but in everyday canine anatomy, the external snout area is called the muzzle.

A handy memory tip: a “muzzle” is also the safety device placed over this area, so the name matches the part it covers. Muzzle shape varies by breed—brachycephalic dogs (like pugs) have short muzzles, while sighthounds have long ones—affecting breathing, scenting, and heat regulation. Whiskers (vibrissae) on the muzzle help dogs sense their surroundings.