When a cat opens its mouth after smelling something - often appearing like a funny “stinkface” – it is displaying what is known as the Flehmen Response.
This behavior helps cats analyze scents more deeply by directing odors to a special sensory organ in their mouth called the vomeronasal or Jacobson’s organ.
The cat’s curling lip and open mouth allow scents to travel to this organ, which enhances their ability to “smell in HD.”
This response is common not only in domestic cats but also in other animals like lions, horses, and giraffes.
*It is usually triggered by unusual or interesting smells, such as the scent of another cat or specific pheromones, especially those related to mating.
Though the expression may look odd or even like disgust, it is actually a sign that the cat is highly interested in the smell and is working to get a better sniff.
This behavior is normal and not a cause for concern unless the cat shows signs of labored breathing or respiratory distress, which would require veterinary attention.
*To encourage this behavior and add some fun enrichment, introducing new, safe scents like catnip can stimulate the flehmen response.
Just be sure to AVOID anything toxic and always opt for scents and items that are safe and enjoyable for cats.
The flehmen response is a fascinating reminder of just how wonderfully unique cats are in how they experience the world around them.
Chewy editorial team encourages you to celebrate these quirky moments as special ways your cat connects with their environment, deepening the bond you share every day.
