A large Dog Aging Project study that analyzed the behavior of more than 43,000 dogs found that over 84% of dogs show at least mild signs of fear or anxiety in everyday situations (Dr. Bonnie Beaver, Texas A&M University, "Veterinary Research Communications," 2026). Most of the time, dogs tell us this through subtle body language - the kind that's easiest to miss.
In this guide you'll learn 15 key dog body-language signals that point to stress, discomfort, or anxiety. You'll learn to spot both the obvious ones and the most subtle - the ones that are easy to overlook, but that can be the first signs of bigger issues, including separation anxiety.
Because every wag - and every stress signal - truly matters.
Why learn to read your dog's body language?
Dogs are masters of nonverbal communication. Over thousands of years they've evolved alongside people, developing unique ways to share emotions and intentions. But research from the University of Liverpool showed that while dogs read our emotions beautifully, most people misread dog behavior or miss it entirely.
Understanding your dog's body language isn't just a fun fact - it's the foundation of a safe, happy relationship with your four-legged friend. Learning to recognize early stress signals lets you step in before things escalate to growling, running away, or - in extreme cases - aggression.
What's more, watching your dog's behavior, especially while you're away, can reveal issues like separation anxiety - a condition that affects as many as 20-40% of household dogs.
Subtle signals - easy to miss
These signs are ignored most often, yet they're also the first to appear. Spotting them lets you respond before the stress builds.
1. Lip licking and nose licking
When your dog often licks its lips or nose without any food around, that's a classic sign of discomfort. This is called lip licking - one of the most underrated stress indicators.
Research published in Behavioural Processes (Albuquerque et al., 2018) showed that dogs lick their lips far more often when looking at photos of people expressing negative emotions than positive ones.
What to watch for: Quick, repeated nose licking, especially in social situations or when your dog is faced with something unfamiliar.
2. Yawning (outside of being tired)
Yes, dogs yawn when they're tired - but also when they're stressed. A "stress yawn" is deeper and longer than a normal tired one. It often shows up in new situations, at the vet, while learning new commands, or when your dog senses tension at home.
Norwegian dog behaviorist Turid Rugaas, author of groundbreaking work on calming signals in dogs, counts yawning among the most important ways dogs communicate discomfort.
What to watch for: Yawning at odd moments - for example, right after waking up, or in a sequence with other stress signals.
3. Turning the head or the whole body away
When your dog looks away or turns its whole body from the source of discomfort, that's a calming signal - a way of saying "I need space" or "this is too much for me."
What to watch for: Deliberate head-turning during interactions with people or other dogs, especially when someone leans over your dog or looks it straight in the eyes.
4. "Whale eye" - a crescent of white in the eye
This is one of the most important warning signals. Whale eye happens when a dog looks to the side without turning its head, showing a crescent-shaped sliver of white in the eye. It's a sign of significant discomfort and often comes right before behavior escalates.
Research in Applied Animal Behaviour Science (Bloom and Friedman, 2013) confirms that whale eye is a reliable predictor of stress.
What to watch for: Visible white in the eye (especially crescent-shaped) while your dog looks to the side but keeps its head still. This is often paired with a stiff body.
5. Muscle tension and body "freezing"
A relaxed dog has a soft, loose body. A stressed dog stiffens - you can see the tension throughout, from a tight jaw to a rigid tail. "Freezing" (freeze) is an especially serious signal - your dog goes completely still, which often means it's weighing fight or flight.
What to watch for: Sudden body stiffness, especially paired with a fixed stare. If your dog "freezes" while eating as someone approaches, that can point to a tendency to guard resources.
Moderate signals - worth your attention
These signals are more visible and point to a rising level of stress. Ignoring them can lead to escalation.
6. Lowered or pinned-back ears
Ear position is one of the most expressive tools in a dog's communication kit. Ears pressed to the head or pulled far back often signal fear, uncertainty, or an attempt to avoid conflict.
It helps to know your dog's natural ear position - every breed (and even every individual dog) has a different "baseline" posture.
What to watch for: Ears pressed tight to the skull or turned clearly backward. In dogs with upright ears - ears dropped to the sides.
7. A tucked or low-carried tail
A tail tucked between the back legs is a universal sign of fear or submission. But watch out: a tail carried low, even with a slight wag, can also signal uncertainty.
Fascinating research from the University of Trento showed that the direction of a tail wag matters - wagging more to the right points to positive emotions, and to the left, negative ones.
What to watch for: A tail tucked under the belly, a tail held still and stiff, or a wag clearly leaning to the left side of your dog's body.
8. Excessive panting (without physical effort)
Panting is a natural way for dogs to regulate their temperature. But when your dog pants heavily in a cool room, without any prior effort, that's a sign of stress. A "stress pant" is often faster and shallower than a normal one.
What to watch for: Panting at rest or in an air-conditioned room, and a wide "smiling" mouth paired with tense corners.
9. Excessive shedding
This is a lesser-known but well-documented sign of stress in dogs. During a vet visit or a stressful situation, your dog may suddenly shed far more heavily than usual.
What to watch for: Sudden, heavy shedding in stressful situations, especially when your dog doesn't normally shed much.
10. Raised hackles on the neck and back
Piloerection (raised fur, known as hackles) is an involuntary response to strong emotions - not necessarily aggression. It can mean fear, excitement, uncertainty, or high arousal.
What to watch for: Raised fur along the spine - from the neck to the base of the tail.
Serious signals - call for an immediate response
These signs point to strong stress or fear. They call for quick action and often a talk with a specialist.
11. Hiding or looking for an escape
When your dog actively looks for a hiding spot - under the bed, behind the couch, in the bathroom - that's a clear sign of strong discomfort. It can be a reaction to noise (a storm, fireworks), the presence of strangers, or a symptom of general anxiety.
What to watch for: Regular hiding in the same circumstances, attempts to "escape" a situation, seeking shelter behind you.
12. Compulsive behaviors and stereotypies
Repetitive, seemingly pointless behaviors - pacing in circles, chewing the paws, chasing its own tail, licking surfaces - can be a symptom of chronic stress or a compulsive disorder.
What to watch for: Behaviors that repeat many times in a short span, are hard to interrupt, and intensify in certain situations. It's also worth watching whether your dog sleeps as much as it should for its age - chronic sleeplessness, or the opposite, sleeping too much, can also be a signal of discomfort.
13. Growling and baring teeth
Growling isn't "bad behavior" - it's a message: "I feel threatened, please give me space." Punishing a dog for growling is dangerous, because it teaches the dog to skip this warning signal and go straight to biting.
As dog behavior experts stress, a growl is a gift - it tells you your dog is at the edge of its tolerance. Instead of punishing, it's worth understanding the cause.
What to watch for: A low, throaty sound, a raised upper lip showing the teeth, a stiff body. Never ignore a growl - instead, remove the source of stress.
14. Trembling and shaking
Trembling with no temperature-related cause (your dog isn't cold) is often a sign of strong fear or anxiety. Some small breeds (Chihuahuas, Yorkshire Terriers) tremble more often for physiological reasons, but even in them, regular trembling in specific situations deserves attention.
What to watch for: Trembling of the whole body or of specific parts, especially paired with other signs of fear.
15. Loss of control over bodily needs
When a previously house-trained dog suddenly starts having accidents indoors - especially while you're away - it can be a symptom of strong stress or separation anxiety. Losing control of the bladder or bowels in stressful situations is a physiological response, not "acting out."
What to watch for: "Accidents" that only happen in certain circumstances (while you're out, after guests visit), especially in dogs that had no trouble with house-training before.
Context is everything - how to read signals correctly
No single signal is the whole answer. A dog that yawns after waking up is tired. A dog that yawns, licks its lips, and turns its head away during a vet visit is probably stressed. That's why it's so important to watch the whole picture - the combination of signals, the context of the situation, and what your dog's "normal" state looks like.
Research from the University of Bristol stresses that reading a dog's body language means taking into account:
- Your dog's history - past experiences shape reactions
- Breed - some breeds naturally express themselves differently
- Individual temperament - every dog is different
- The specifics of the situation - the same signal can mean different things in different contexts
Tip: Keep a "behavior journal" for your dog. Note when and in what circumstances certain signals appear. After a few weeks you may spot patterns that help you understand your dog better.
Stress signals and separation anxiety - how they connect
Many of the stress signals above intensify or appear only while you're away. That can be a sign of separation anxiety - a condition affecting millions of dogs around the world.
According to a meta-analysis published in Applied Animal Behaviour Science, separation anxiety affects 20-40% of household dogs, and the typical signs include:
- Vocalizing - barking, whimpering, howling
- Destruction - chewing doors, furniture, rugs
- Accidents indoors - having accidents at home despite prior house-training
- Signs of physical stress - panting, drooling, pacing in circles
The tricky part is that most of this happens while you're not home. You don't see how your dog reacts when you leave. You don't know whether it settles down after 10 minutes, or paces the apartment in stress for 8 hours.
That's why watching your dog's behavior while you're away matters so much. Apps like Merdilo use artificial intelligence to analyze the sounds your dog makes and its activity patterns, helping you understand what's really going on with your dog when you leave the house.
Keep an eye on your dog with Merdilo
Recording your dog while you're away is the first step to understanding the problem. Merdilo helps you see what's really happening - and automatically spots signs of stress.
What to do when you notice stress signals in your dog
Spotting a signal is only the first step. Here's what you can do:
Don't brush it off. Subtle signals matter. If your dog regularly shows signs of discomfort in certain situations, it's worth taking a closer look.
Remove the source of stress (if you can). If your dog clearly feels uncomfortable in a situation - for example, in a crowd - give it space. Don't force a confrontation.
Be a calm presence. Your emotions affect your dog. Stay calm, speak in a gentle tone. Research shows dogs are attuned to their pet parent's emotions and can "catch" your stress.
Watch and take notes. Keeping a behavior journal will help you identify stress triggers and track progress.
Talk to a specialist. If stress signals are frequent, intense, or come with other behavioral issues, it's worth booking an appointment with a veterinary behaviorist. Some cases need professional support, and the specialist will decide what form it should take.
Watch behavior while you're away. If you suspect your dog struggles with being left alone, consider using a monitoring app. Knowing what really happens when you leave is priceless.
In short - your dog is talking to you
Dog body language is a rich, complex language - and it's worth learning. The 15 stress signals you've learned in this article are a foundation that will help you understand your four-legged friend better.
Remember:
- Subtle signals (lip licking, yawning, whale eye) are often overlooked, but extremely important
- Context is everything - a single signal isn't the whole answer
- A combination of signals gives a fuller picture of your dog's emotional state
- A growl is a message, not "bad behavior" - never punish it
- Watching while you're away can reveal issues you don't see day to day
Your dog tries to tell you something every day. Now you have the tools to listen.
Because every wag matters - and so does every stress signal.
Frequently asked questions (FAQ)
Does one stress signal mean my dog has a problem?
Not necessarily. A single signal, like a yawn or a lip lick, can have many causes. Pay attention to combinations of signals and the context they appear in. If you see several signals at once, or regularly in the same circumstances, it's worth taking a closer look.
My dog always carries its tail low - does that mean it's always sad?
Not every low-carried tail means sadness. Some breeds (such as Greyhounds and Whippets) naturally carry their tail low. What matters is knowing your dog's "baseline" tail position and watching for changes from it.
How can I tell a tired yawn from a stress yawn?
A stress yawn often shows up at odd moments - for example, when your dog has just woken up, is in a new situation, or is at the vet. It's usually paired with body tension and other stress signals. A tired yawn is "softer" and happens when your dog genuinely needs rest.
Should I punish my dog for growling?
Definitely not. A growl is a valuable warning - your dog is telling you it's at the edge of its tolerance. Punishing a growl teaches your dog that it can't warn you, which raises the risk of a sudden bite. Instead of punishing, remove the source of stress and think about the cause.
When should I see a specialist?
Consider talking to a veterinary behaviorist if: stress signals are very frequent or intense, destructive or aggressive behavior appears, you suspect separation anxiety, or your own efforts to help aren't working.
Scientific sources
- Albuquerque, N., et al. (2018). "Dogs recognize dog and human emotions." Behavioural Processes, 152, 74-82.
- Beaver, B. V. (2026). "Owner-reported prevalence and severity of fear and anxiety in dogs." Veterinary Research Communications. DOI: 10.1007/s11259-026-11227-y.
- Beerda, B., et al. (1998). "Behavioural, saliva cortisol and heart rate responses to different types of stimuli in dogs." Applied Animal Behaviour Science, 58(3-4), 365-381.
- Blackwell, E. J., et al. (2013). "Fear responses to noises in domestic dogs." Applied Animal Behaviour Science, 145(1-2), 15-25.
- Bloom, T., & Friedman, H. (2013). "Classifying dogs' facial expressions from photographs." Applied Animal Behaviour Science, 149(1-4), 7-21.
- Bradshaw, J. W., et al. (2002). "Aetiology of separation-related behaviour in domestic dogs." The Veterinary Record, 151(2), 43-46.
- Casey, R. A., et al. (2014). "Human directed aggression in domestic dogs." Applied Animal Behaviour Science, 152, 52-63.
- Döring, D., et al. (2009). "Fear-related behaviour of dogs in veterinary practice." The Veterinary Journal, 182(1), 38-43.
- Quaranta, A., et al. (2007). "Asymmetric tail-wagging responses by dogs to different emotive stimuli." Current Biology, 17(6), R199-R201.
- Rugaas, T. (2006). On Talking Terms with Dogs: Calming Signals. Dogwise Publishing.
- Sherman, B. L., & Mills, D. S. (2008). "Canine anxieties and phobias." Veterinary Clinics of North America: Small Animal Practice, 38(5), 1081-1106.
This article is for educational purposes and does not replace a veterinary consultation. If you suspect separation anxiety or other behavioral issues in your dog, talk to a specialist.