I have no idea - there's no medical reason for this. I would guess someone somewhere claimed this was a good "natural" or "herbal" remedy for something, although I will point out most vanilla extract is artificial and has no real vanilla in it.
This is also a pretty bad idea - the risk of inhaling the liquid and causing inflammation in the nose is pretty high. Also, dogs have very sensitive senses of smell - this is the equivalent of putting an air horn to your ear and hitting the button. This would cause a great deal of distress and irritation to your dog, and there's no reason to be mean to your dog like that.
Additional information:
It is not put on the nose, but some dog breeders have used a small dab of vanilla extract on a male dog's collar to keep him from getting too whiny and anxious from the scent of a nearby female who is in heat. They say it partially masks the scent of the female.
To make the dog's nose white.
Why would you want to do that? I am sure you know where to buy vanilla extract but rubbing it on a dogs nose would be ridiculous so I think this is another nonsense question and that is all that I see on this site. It doesn't hold a candle to the old ask. Com is the community of that was great and there were serious questions and good answers. This site appears to be a bunch of immature idiots wasting their time. If I am wrong please direct me to better questions
There is no bone that makes dogs' noses go black. The black color in their nose is caused from pigment. A lack of pigment in the nose would result in a pinkish colored nose and it would sunburn easily.
No two nose prints are alike a dogs nose print is like our finger print.
Nose!
No
Allergic reaction?
No. Why would we use nose prints when we now have microchips to locate our lost animals?
No!
No
Give her this percise recipe: 1/2 cup vanilla extract 2 cups hot sauce 3 ounces pelligrino mineral water 1 nose job -then rest for 8 hours and her voice will be golden!
=== Yes dogs do have fingerprints. They are on there nose, which is wierd.===
Dogs can pick up smells better than humans -yes.