early 13c., "trunk or projecting nose of an animal," from Middle Low German and Middle Dutch snute "snout," from Proto-Germanic *snut- (source also of German Schnauze, Norwegian snut, Danish snude "snout"), which Watkins traces to a hypothetical Germanic root *snu- forming words having to do with the nose, imitative of a sudden drawing of breath (compare Old English gesnot "nasal mucus;" German schnauben "pant, puff, snort" (Austrian dialect), schnaufen "breathe heavily, pant," Schnupfen "cold in the head;" Old Norse snaldr "snout" (of a serpent), snuthra "to sniff, snuffle"). Of other animals and (contemptuously) of humans from c. 1300.
breed of terrier with a bearded muzzle, 1923, from German Schnauzer, literally "growler," from schnauzen "to snarl, growl," from Schnauze "snout, muzzle," which is related to Middle English snute, snoute "snout" (see snout).
<a href="https://www.etymonline.com/word/schnozz">Etymology of schnozz by etymonline</a>
Harper, D. (n.d.). Etymology of schnozz. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/schnozz