Why do dogs sniff?

Many dog owners wonder why dogs sniff around. The answer is actually quite simple. Sniffing reduces a dog’s stress levels. Because they smell so much while sniffing, endorphins are released, and this hormone promotes relaxation. If you have a dog that sniffs frequently, it will most likely have lower cortisol levels and will also sleep better. Cortisol is the stress hormone in dogs.

Dopamine is also a very important hormone here, as it gives your dog a pleasant feeling. Dopamine is released in dogs when they sniff too.

When dogs sniff, they focus on one sense: smell. The other senses, such as hearing and sight, become less active at that time. Smell is the most important sense for dogs, and depending on the specific scent, a dog's nose can pick up odours at concentrations far below what a human could ever detect [1]. They use their noses to gather information, not only about their immediate surroundings but also about the wider environment.

Sniffing is natural behaviour for dogs. They become stressed and frustrated when they are not allowed to sniff. Telling a dog not to sniff is a bit like telling them not to be social. Sniffing, detecting scents and leaving scent marks acts as a kind of social media for them.

Reasons why dogs sniff

Dogs sniff for various reasons:

• Analysing scents. A dog's nose can pick up far more detail in a smell than ours ever could.
• Communicating with other dogs. When your dog is sniffing, it can pick up information from other dogs, who leave scent marks via their urine and the glands in their paws.
• Exploration and orientation. Dogs understand their surroundings and feel safer after they've had a proper sniff.
• Searching for food or toys. Dogs naturally use their noses to track down food.
• Stress reduction. Sniffing around has a calming effect on dogs. A sniffing walk is often much more tiring than a normal walk.

Is sniffing tiring for dogs?

Sniffing is very tiring for dogs; it can be just as tiring as physical exercise, because of the mental stimulation involved. Sniffing activates and exercises the brain. This can leave dogs feeling quite tired after a lot of sniffing, just like after a walk. If your dog is exploring its surroundings calmly and quietly, mainly using its nose, that's usually a sign of a relaxing walk in an environment that isn't causing it any stress.

Why does my dog sniff so much during walks?

Dogs sniff most while walking. When they do, they gather a lot of information from their surroundings, and sniffing also reduces stress in dogs. By sniffing, dogs can detect scents left behind by other dogs, track down food, or pick up on changes in their surroundings. What dogs sniff for most are territorial markings, the presence of other animals, and potential dangers. It's a natural instinct that provides a wealth of sensory information.

Is it okay for a dog to sniff around during walks?

Yes, definitely let them sniff; it makes your dog happy and relaxed. It's also important that your dog still listens and doesn't drag you from bush to bush. With a few commands, though, it's perfectly possible to let your dog know when sniffing is allowed and when it isn't.

How tiring is sniffing for your dog?

Sniffing can also help your dog if they struggle with behavioural problems such as destructiveness or hyperactivity. Because sniffing is so tiring for dogs, it lets your dog burn off energy in a positive way.

What do dogs think when they're sniffing?

Dogs think various things while they're sniffing; they use their noses to understand the world, much like we use our eyes. When your dog is sniffing, it might be thinking:

• Who's been here?
• What has happened?
• Is there food nearby?
• Is there any danger?
• How do I feel?

Which scent calms dogs?

Lavender is well known for its calming and relaxing effect. This applies not only to people, but to dogs too. In a study of dogs in a rescue shelter, an environment that's stressful by nature, dogs exposed to lavender scent panted and vocalised noticeably less than dogs with no scent enrichment, and the calming effect carried on for hours after the exposure ended [2]. You can use lavender oil if you want your dog to be, or become, a bit calmer, and it's often used during periods when a dog is under a lot of stress, such as fireworks, strong winds and thunderstorms.

How important is sniffing for dogs?

Sniffing is very important for dogs. They don't just sniff to explore; it has real mental and physical benefits too.

Sniffing contributes to your dog's mental stimulation and challenges its brain, which can help with boredom and stress. It also has a relaxing, stress-reducing effect; dogs that sniff frequently are generally calmer and happier. Sniffing can also help with behaviour: when dogs get enough opportunities to sniff, they're less likely to develop behavioural problems. A sniffing walk, where your dog is given plenty of time to explore all sorts of smells, can often be more tiring than a long walk without any sniffing at all. It's an ideal way to keep your dog content.

Should I stop my dog from sniffing?

It's best not to stop your dog from sniffing, precisely because it's a natural and important activity. Sniffing has real benefits for your dog.

When should you limit sniffing?

Of course, you must stop your dog from sniffing if it puts them in a dangerous situation. Think of rubbish, glass or toxic substances. You can build sniffing breaks into your walks; your dog will quickly learn the pattern. If your aim in a particular walk is to keep moving and teach your dog something, it's best to alternate sniffing breaks with periods of walking. Let your dog sniff, but they should still listen, so it's fine to call a stop to the sniffing if they stop responding to your commands.

Conclusion: Why do dogs sniff?

Sniffing is a natural and essential activity for dogs. It lets them gather information, communicate, reduce stress and engage in mental and physical stimulation. So give your dog plenty of opportunities to sniff, but make sure there's a good balance between sniffing and listening. And reward your dog when they get that balance right.