Dogs have whiskers because they act as sensitive sensory organs that give the dog information about its surroundings which sight and smell cannot provide on their own. The stiff hairs around the muzzle, eyes and chin detect touch, air movements and distances to things close by, and help the dog navigate, judge whether it can pass through a narrow opening and protect its vulnerable eyes. Whiskers are therefore not ordinary hairs, but an active sensory tool the dog uses all the time.
The technical name for whiskers is vibrissae. They are thicker and stiffer than the rest of the coat and sit deeply anchored in the skin in a small pouch surrounded by a network of nerve endings and blood-filled tissue. When the tip of the hair is touched or bent by an air current, the movement is amplified at the root and sends a signal to the brain. This is precisely why even the smallest influence is enough for the dog to feel it.
Where the whiskers are located, and what they detect
Most people associate whiskers with the muzzle, but the dog has them in several places on its face. The most prominent ones sit in horizontal rows on both sides of the upper lip. In addition, there are whiskers above the eyes, on the chin and just below the chin. Each area has its own task. The hairs by the mouth help the dog feel objects very close up, where its own eyes have a blind spot right in front of and below the muzzle. The hairs above the eyes trigger a reflex that closes the eye as soon as something brushes against them, which protects the eye from branches, tall blades of grass and other things.
Because the whiskers react to air movements, the dog can also sense that an object is close by without touching it. The air pushed in front of a hand or a wall sets the hairs in motion, and the dog thereby gets a kind of touch-free feel for the space around its head. This is part of the explanation for why dogs can orient themselves surprisingly reliably in the dark or in completely new surroundings.
How the dog uses whiskers to measure distances and passages
One of the whiskers' most important functions is to help the dog assess whether it can get through an opening. The hairs on the sides of the muzzle reach roughly out to the dog's widest point, and when they touch the edges of a passage, the dog gets a sense of whether there is enough room. It is the same logic familiar from cats, and it is one of the reasons why whiskers should never be cut: without them, the dog loses an important tool for judging distances very close up.
The whiskers also play a role when the dog examines something on the ground. The hairs beneath the chin help it feel an object the dog has its muzzle close to, and provide a feel for surfaces it cannot see because the muzzle blocks the view. Together this gives the dog a detailed picture of what is located in the nearest zone around its head.
Whiskers as part of the dog's body language
Whiskers do more than feel. They can also say something about the dog's mood. When a dog is attentive, curious or excited, the whiskers by the mouth can rise slightly and point forward. When the dog is relaxed, they lie more flat. It is a subtle detail, but it forms part of the overall body language together with the ears, tail and posture, and the experienced dog owner learns to read it over time.
Because the whiskers are so closely connected to the nervous system, the area around them is also more sensitive than the rest of the face. That is worth remembering when you touch the dog's muzzle, or when the dog meets new people who would like to pat it right on the snout.
This is why you must never cut or trim the whiskers
Whiskers fall out and grow back again like other hairs, and a single hair that falls out naturally is nothing to worry about. The problem is cutting them on purpose. Some people cut the whiskers for a neater, more uniform appearance, especially before shows, but this removes an active sensory organ from the dog. A dog without whiskers loses part of its ability to judge distances close up and to protect its eyes, and it may seem more insecure in the dark or in unfamiliar surroundings until the hairs have grown back.
The cutting itself does not hurt, because the hairs themselves have no sensory nerves, but it is the equivalent of temporarily switching off a sense the dog depends on. So leave the whiskers alone, both when you groom the dog yourself and when you agree with a groomer on what should and should not be done.
When whiskers are a reason to contact the vet
In the vast majority of cases, whiskers require no attention. But if you notice that the dog suddenly loses an unusually large number of whiskers, develops swellings, sores or scabs around the hair roots, or seems tender when its muzzle is touched, it is a good idea to have it assessed by a vet. The whiskers' roots are closely connected to the skin, and changes there can reflect something that should be looked into.
A well-nourished, healthy coat starts from within, and that also applies to fur and whiskers. A well-balanced diet with good fatty acids supports the skin and coat, and here a supplement of fish oil with omega-3 can be a natural complement to the daily meal. If you want to give the skin and coat extra support through the feeding itself, ESSENTIAL FOODS' LIVING meals are composed of fresh raw ingredients and human-grade ingredients with well-being specifically in mind. If you are unsure which suits your particular dog best, ESSENTIAL FOODS' nutritional advisers are ready by phone, chat and email to help you find the right meal.
The whiskers are, in other words, a small but significant part of how the dog experiences the world. They help it feel, measure and protect itself, and at the same time they tell us a little about how the dog is feeling. When you understand what they are used for, it also becomes clear why they deserve to be left in peace to do their job.