Dogs with anxiety show a recognizable pattern of physical and behavioral changes, from excessive panting and pacing to destructive behavior when you leave the house. Some signs are obvious, but others are easy to miss or mistake for stubbornness. Knowing what to look for helps you figure out whether your dog is genuinely anxious or just having a bad day.
The Physical Signs of Anxiety
An anxious dog’s body tells you what’s happening before their behavior does. The most common physical signs include trembling, excessive drooling, and heavy panting when they haven’t been exercising or aren’t hot. You may also notice sudden, heavy shedding in stressful situations, which catches many owners off guard.
Pay attention to your dog’s posture and face. An anxious dog typically carries a lowered body stance with ears pulled back or flattened. Their tail drops low or tucks between their legs. One of the most reliable indicators is “whale eye,” where enough of the white around the eye becomes visible that the dog looks wide-eyed or startled. Dilated pupils often accompany this.
Some dogs urinate or defecate inside the house during anxiety episodes. This is not spite or poor training. It’s a genuine stress response, especially common in dogs with separation anxiety. If your otherwise house-trained dog starts having accidents only when you’re gone, anxiety is the most likely explanation.
Behavioral Red Flags to Watch For
Beyond body language, anxious dogs develop behavioral patterns that often get misread as disobedience. The key ones include:
- Destructive behavior: chewing door frames, scratching at windows, shredding furniture, particularly when left alone
- Excessive vocalization: persistent barking, whining, or howling that seems out of proportion to the situation
- Pacing and restlessness: walking the same path repeatedly, inability to settle even in a calm environment
- Avoidance or hiding: withdrawing from family members, retreating under beds or into closets
- Lip licking when not hungry and yawning when not tired: both are displacement behaviors dogs use to self-soothe
A dog wagging its tail slowly while looking away from you isn’t being aloof. That combination often signals mild anxiety. The slow wag paired with averted gaze is a calming signal, a way of communicating discomfort without escalating the situation.
The Three Most Common Types
A large study of over 13,700 pet dogs found that noise sensitivity is the most common anxiety-related trait, affecting about 32% of dogs. Fear of unfamiliar people, animals, or situations came second at 29%. Separation-related behavior, though it gets the most attention from owners, was actually the least common at around 5%.
Noise Sensitivity
Dogs with noise anxiety react to sudden or loud sounds like thunder, fireworks, vacuum cleaners, or construction noise. The median age of onset is around 2 years, though it can appear anywhere from 8 weeks to 10 years old. If your dog suddenly starts reacting to storms at age 4, that’s well within the normal range for this type of anxiety to develop. Signs include hiding, trembling, trying to escape, and refusing to go outside.
Fear and Social Anxiety
This shows up when your dog encounters unfamiliar people, other dogs, new environments, or strange objects. A dog with social anxiety may cower when a stranger tries to pet them, freeze on walks near flapping flags or trash bags, or become reactive when an unfamiliar dog approaches. Some dogs express fear through aggression, lunging, or barking, which is often mislabeled as a “dominance” problem when it’s actually rooted in anxiety.
Separation Anxiety
This one is usually the easiest to identify because the signs appear on a predictable schedule: when you leave or prepare to leave. Classic signs include distress vocalization (howling, barking), destructive behavior focused on exits like doors and windows, house soiling, and pacing. Some dogs begin showing anxiety the moment they see you pick up your keys or put on shoes. The destruction isn’t random. It’s concentrated around barriers between the dog and where you went.
What’s Happening Inside Your Dog’s Body
Anxiety in dogs involves the same stress hormone system that operates in humans. When your dog perceives a threat, their body releases cortisol, the primary stress hormone. In a short burst, this is normal and healthy. The problem comes when the stress response fires repeatedly or never fully turns off.
Dogs respond to threats with different coping styles, and these are tied to how much cortisol their body produces. Passive responders, the dogs that freeze, cower, or try to flee, show cortisol spikes averaging about 80% above baseline. Dogs that react by investigating or engaging with the threat show only about a 16% cortisol increase. This means the quiet, withdrawn dog hiding under your desk may actually be experiencing far more physiological stress than the dog that barks at the stimulus. Stillness doesn’t mean calm.
When Anxiety Becomes a Problem
Every dog gets nervous sometimes. A puppy startled by their first thunderstorm or a rescue dog that’s cautious around new people is showing a proportional response to their experience. Anxiety crosses into a clinical concern when it’s persistent, disproportionate to the trigger, or interferes with your dog’s daily life.
Watch for patterns rather than isolated incidents. A dog that occasionally whines when you leave is different from one that destroys the crate every single time. Frequency and intensity matter. If the behavior is escalating over time rather than improving, or if your dog can’t recover from a stress response within a reasonable period, that’s a signal the anxiety has moved beyond what normal reassurance and routine can fix.
Older dogs that develop new anxiety symptoms, especially nighttime pacing, restlessness, and panting, may be experiencing cognitive dysfunction syndrome, the canine equivalent of dementia. This is distinct from other anxiety types and typically appears in senior dogs who were previously calm and well-adjusted.
Getting a Professional Assessment
A veterinarian should be your first stop, not a trainer. Medical conditions, from pain to thyroid imbalances, can produce symptoms that look identical to anxiety. A vet can rule those out before you start working on behavior. Dogs showing aggression, anxiety-based behavior, or difficulty responding to normal training are candidates for referral to a veterinary behaviorist, who has specialized training beyond what general practitioners or dog trainers offer.
You can start tracking your dog’s behavior at home using the same framework researchers use. Note how your dog responds to specific triggers: unfamiliar people approaching, loud noises, being left alone, encountering strange objects, meeting other dogs, visiting new places, and being groomed or handled. For each trigger, rate the response from no visible fear to extreme fear (cowering, retreating, hiding). For separation behaviors, track how often your dog paces, vocalizes, or destroys things when left alone, from never to always. Bringing this kind of specific record to a vet appointment gives them much more to work with than a general description of “my dog seems anxious.”
The distinction between normal nervousness and clinical anxiety often comes down to whether your dog can function. A dog that’s briefly startled by fireworks but settles within minutes is coping. A dog that pants, shakes, and hides for hours after the last boom has stopped is not. Trust what you’re observing. You know your dog’s baseline better than anyone.