The reason I ask is that noses work just as well as fingertips for unlocking the iPhone 6 (and possibly earlier models). Noses can be more useful than fingers, especially in winter weather when you want to wear gloves. However, this raises a security issue - if nose prints are not unique then theoretically anyone's nose could give them access to your phone.
Of course, if you always have your dog with you then it's secure to use your dog's nose print to unlock your iPhone. Dog nose prints are unique. Just another way service dogs can help their owners ;)
Serious question. Perhaps you know some expert that can answer it? I'm fed up with reading about dog nose prints!