Why do Dogs mouths quiver after Licking pee?

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In the fascinating world of canine behavior, there are peculiarities that often leave us puzzled and curious. One such enigma is the quivering of a dog’s mouth after licking pee. As pet owners, we may have observed this peculiar phenomenon and wondered about its underlying cause. Why do dogs exhibit this behavior? What purpose does it serve? In this comprehensive blog post, we will embark on a journey of exploration to unravel the mystery behind why dogs’ mouths quiver after indulging in such an unconventional activity.

Why do Dogs mouths quiver after Licking pee?

The Science Behind Canine Taste Sensation

To understand why dogs’ mouths quiver after licking pee, we must first delve into the intriguing realm of canine taste sensation. Dogs possess an extraordinary sense of taste, albeit different from ours. While humans have approximately 9,000 taste buds, dogs have significantly fewer, with estimates ranging from 1,700 to 2,000 taste buds. However, what they lack in quantity, they make up for in complexity.

The Unseen World of Pheromones

Pheromones play a significant role in a dog’s life, serving as invisible communication tools among individuals of the same species. These chemical messengers are released through various bodily secretions, including urine. Dogs possess an astounding ability to detect and interpret pheromones, thanks to a specialized structure in their noses called the vomeronasal organ, or Jacobson’s organ. The quivering of a dog’s mouth after licking pee could be attributed to the intricate process of deciphering the hidden messages encoded within the pheromones.

When a dog’s tongue comes into contact with urine, the pheromones present in it are captured by the vomeronasal organ. This delicate organ enables the dog to extract a wealth of information about the pee’s source, including the sex, reproductive status, and even emotional state of the dog who left the urine. The quivering of the mouth that follows could be a reflexive response to the influx of sensory input, as the dog’s brain processes the intricate olfactory messages conveyed by the pheromones.

Exploring the Taste Spectrum

While urine is not conventionally regarded as a delectable treat, dogs have unique taste preferences that may differ from our own. The quivering of a dog’s mouth after licking pee may arise from the complex interplay of taste and sensory experience. Although humans perceive urine as bitter and unpleasant, dogs possess a specialized taste receptor that allows them to detect and differentiate between a wider range of flavors, including those present in urine.

Within the canine taste spectrum, there are receptors dedicated to identifying specific compounds that contribute to the distinct taste of urine. These compounds, such as urea and ammonia, may trigger a fascinating cascade of neural activity in a dog’s brain, resulting in the observed quivering of the mouth. It is essential to recognize that dogs have evolved to survive in different ecological niches, and their taste preferences have adapted accordingly.

The Role of Evolutionary History

To truly comprehend the quivering behavior, we must turn to the pages of evolutionary history. Dogs, as descendants of wolves, have inherited numerous traits that allowed their ancestors to thrive in the wild. In the case of licking urine, this behavior can be traced back to the wolves’ territorial marking instincts.

Wolves, like their domesticated counterparts, leave their scent through urine to establish and defend their territories. By licking urine, dogs might be emulating an instinctual behavior, seeking to gather vital information about their surroundings. The quivering mouth could be a result of the intricate interplay between ancestral instincts and the sensory overload triggered by the act of tasting urine.

Emotional Significance

While the act of licking pee may seem unappealing to us, it holds emotional significance for dogs. Canines are social animals that rely heavily on scent-based communication. By licking urine, dogs engage in a form of olfactory exploration, gathering valuable information about their environment and the individuals present within it.

The quivering of the mouth after licking pee could be linked to the emotional response triggered by the sensory experience. Just as humans may display physical reactions when experiencing intense emotions, such as trembling or shivering, dogs may exhibit a similar response. The quivering mouth could be a manifestation of the dog’s heightened state of excitement, curiosity, or even satisfaction derived from engaging in a behavior that is deeply ingrained in their social and evolutionary makeup.

Sensory Overload and Overstimulation

Another aspect to consider is the potential sensory overload and overstimulation that dogs may experience when licking pee. The combination of pheromones, taste, and the wealth of information embedded in urine can create a sensory explosion in a dog’s brain. This sensory overload might manifest as the quivering of the mouth, a physical response to the surge of information being processed.

Furthermore, the act of licking urine may trigger a mix of sensations that dogs find simultaneously intriguing and overwhelming. Dogs have a heightened sense of smell and taste, and the unique combination of odors and flavors present in urine could elicit an intense sensory response. The quivering mouth might be a natural physiological response to regulate and process the sensory stimuli, allowing the dog to assimilate the information in a controlled manner.

Individual Variations and Personal Preferences

It is important to acknowledge that not all dogs exhibit the quivering mouth behavior after licking pee. Just like humans, dogs are individuals with their own preferences and idiosyncrasies. Some dogs may find the taste or smell of urine more enticing, while others may not display any noticeable reaction at all. The absence of a quivering mouth does not necessarily indicate a lack of interest or enjoyment on the part of the dog.

Factors such as age, breed, individual temperament, and past experiences can influence a dog’s response to licking pee. Additionally, training and socialization play a role in shaping a dog’s behaviors and reactions. It is crucial to respect and understand these individual variations, allowing each dog to express their unique preferences and instincts within the boundaries of responsible pet ownership.


In conclusion, the quivering of a dog’s mouth after licking pee is a multifaceted phenomenon that encompasses various factors, including the intricate science of taste sensation, the detection of pheromones, evolutionary instincts, emotional significance, sensory overload, and individual variations. By exploring these aspects, we can gain a deeper understanding of why dogs engage in this behavior. While it may seem peculiar to us, it is a natural expression of their sensory and social world. As responsible pet owners, let us embrace the quirks and complexities of our canine companions, celebrating their unique behaviors while ensuring their health and well-being.

Why do Dogs mouths quiver after Licking pee?
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