Pies: Dogs have a wet nose to collect more of the tiny droplets of smelling chemicals in the air

Evidence: 54 • authority: 72

The dog sense of smell is the most powerful sense of this species, the olfactory system of canines being much more complex and developed than that of humans. It is believed to be up to 10 million times as sensitive as a human's in specialized breeds. Dogs have roughly forty times more smell-sensitive receptors than humans, ranging from about 125 million to nearly 300 million in some dog breeds, such as bloodhounds. These receptors are spread over an area about the size of a pocket handkerchief (compared to 5 million over an area the size of a postage stamp for humans). Dogs' sense of smell also includes the use of the vomeronasal organ, which is used primarily for social interactions. The d…

Evidence: 45 • authority: 80

The Photonic Nose: Smelling Chemicals with Structural Color

Evidence: 45 • authority: 80

Smelling chemicals with a photonic nose

Evidence: 45 • authority: 80

When your eyes have a wet nose: the evolution of the use of guide dogs and establishing the seeing eye

Evidence: 45 • authority: 72

The rhinarium (Neo-Latin, "belonging to the nose"; pl.: rhinaria) is the furless skin surface surrounding the external openings of the nostrils in many mammals. Commonly it is referred to as the tip of the snout, and breeders of cats and dogs sometimes use the term nose leather. Informally, it may be called a "truffle", "wet snout," or "wet nose” because its surface is moist in some species: for example, healthy dogs and cats. In many species, the rhinarium has a mid-line groove (cleft) – the philtrum – and a wrinkled (crenellated) surface. The rhinarium is a separate sense organ: it is a touch-based chemosensory organ that connects with a well-developed vomeronasal organ (VNO). The rhinari…

Evidence: — • authority: 38