18/06/2026
🐶👃 Jacobson’s Organ: Your Dog’s Secret Superpower!
Have you ever noticed your dog intensely sniffing a patch of grass, another dog’s urine, or even chattering their teeth afterwards? They are probably the Jacobson’s Organ, also known as the Vomeronasal Organ (VNO).
🔬 What is Jacobson’s Organ?
Jacobson’s Organ is a specialised sensory structure located in the roof of a dog’s mouth, just behind their upper front teeth. It connects to the nasal cavity through tiny ducts and allows dogs to detect chemical signals that their ordinary sense of smell cannot fully analyse.
👃 A Second Sense of Smell
While a dog’s nose is already extraordinary (with up to 300 million scent receptors compared to our 5 - 6 million), Jacobson’s Organ serves a different purpose.
Rather than detecting everyday odours such as food or environmental scents, it specialises in detecting pheromones and other chemical messengers.
💡 What are pheromones?
Pheromones are chemical signals released by animals that can communicate information such as:
🐕 Reproductive status
🐕 Social relationships
🐕 Territorial boundaries
🐕 Stress and emotional states
🐕 Individual identity
When dogs investigate urine, faeces, scent markings, or even areas where another animal has recently been, they’re gathering a remarkable amount of information.
In many ways, it’s the canine equivalent of reading someone’s social media profile!
🐾 Why do dogs spend so long sniffing?
Because they’re not just smelling.
They’re collecting and analysing information about:
✔️ Who was here
✔️ How long ago they were here
✔️ Whether they were male or female
✔️ Their reproductive status
✔️ Their emotional state
✔️ Their general health
What looks like “just sniffing” to us is actually an incredibly sophisticated form of information gathering.
🐶 Why should owners care?
Allowing dogs time to sniff during walks isn’t a waste of time 👉 it’s an important species-specific behaviour that provides:
🌱 Mental enrichment
🧠 Cognitive stimulation
😌 Stress reduction
🐕 Opportunities for natural investigation
Research confirms that sniffing activities can lower heart rate and promote emotional wellbeing in dogs.
So next time your dog insists on investigating that interesting scent patch for several minutes, remember:
💢They’re not being stubborn.
💢They’re reading the local news. 📰🐾
😌A fun fact: Jacobson’s Organ is also found in many other animals, including cats, horses, snakes, and some mammals. Cats often use it during the well-known “stinky face” response called the Flehmen Response, where they curl their upper lip to direct scent molecules towards the organ. 🐱👃
