Short Answer
Complete Explanation
Lip licking in dogs, often referred to as a “flick” of the tongue, is a common behavior that serves various physiological and psychological purposes. Because dogs cannot communicate via speech, they rely on these subtle body language cues to convey their internal state or respond to external stimuli.
- Calming Signals: In many contexts, lip licking is a “displacement behavior” used to soothe themselves or signal to others that they are anxious, stressed, or trying to avoid conflict.
- Anticipation of Food: When a dog smells or sees food, salivation increases. Licking the lips is a natural response to clear excess saliva or a sign of excitement and appetite.
- Physical Irritation: The behavior may be a response to a foreign object, a taste they dislike, or an underlying medical condition such as dental disease or oral inflammation.
- Social Deference: In canine social hierarchies, a subordinate dog may lick its lips to signal non-aggression to a more dominant dog.
History / Background
The study of canine communication has evolved from simple obedience training to the complex field of ethology. Early observations of domestic dogs suggested that lip licking was merely a grooming habit. However, the work of modern animal behaviorists, most notably Turid Rugaas, introduced the concept of “calming signals.” These signals are believed to be rooted in the ancestral behavior of wolves and wild canines, where subtle gestures were used to maintain pack harmony and prevent violent confrontations. By identifying these micro-expressions, researchers have been able to better understand the cognitive and emotional depth of the domestic dog.
Importance and Impact
Recognizing the meaning of lip licking is critical for the safety and well-being of both humans and animals. When a dog is licking its lips due to stress or fear, it is often a precursor to more defensive behaviors, such as growling or biting, if the stressor is not removed. For veterinary professionals, frequent and compulsive lip licking can be a clinical indicator of nausea, kidney issues, or periodontal disease, allowing for earlier diagnosis and intervention.
Why It Matters
For pet owners and trainers, interpreting this behavior allows for a more empathetic and effective approach to dog management. Instead of pushing a dog through a frightening experience (such as a bath or a vet visit), a handler who notices lip licking can pause, provide space, or use positive reinforcement to lower the dog’s anxiety. This improves the human-canine bond and reduces the likelihood of behavioral incidents.
Common Misconceptions
A dog licking its lips always means it wants a treat.
While it can indicate hunger, it is frequently a sign of anxiety or a request for space, especially in unfamiliar environments.
Lip licking is always a sign of guilt after doing something wrong.
Dogs often display “guilty looks” (including lip licking) not because they feel moral regret, but because they are reacting to the owner’s angry body language and tone.
FAQ
How can I tell if my dog is stressed or just hungry?
Observe the context. If the dog is in a kitchen or looking at a treat, it is likely hunger. If they are at the vet or meeting a strange dog, it is likely stress.
Should I be worried if my dog licks their lips constantly?
If the behavior is sudden, compulsive, or accompanied by bad breath or drooling, a veterinary checkup is recommended to rule out oral pain or systemic illness.
Does lip licking mean the dog is about to bite?
Not necessarily, but it is a sign of discomfort. If ignored, the dog may escalate to more direct warnings like growling.
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