Why Is My Dog Panting So Much? UK 2026 Guide to Anxiety vs Medical Causes

Triage table — anxiety panting vs medical panting

Owner-level cues you can use without a stethoscope. If the picture is mixed, assume medical until a vet says otherwise.

Cue	Anxiety panting	Medical panting
Trigger context	Clear trigger — owner leaving, fireworks, storms, vet visits, travel	No obvious trigger; or follows heat, illness, pain, mild exertion, rest
Onset speed	Starts as soon as the trigger appears	Gradual over hours/days, or after very mild activity, or in warm weather
Resolution	Eases once the trigger stops and the dog feels safe	Persists despite rest, a cool room and quiet; often recurs
Body language	Pacing, hiding, trembling, ears back, tail tucked, lip-licking, yawning, "whale eye"	Neck extended, elbows out, noisy breathing, weakness, collapse, coughing, abnormal gums, abdominal swelling
Time pattern	Predictable — owner departures, evenings, thunderstorms	Any time. Worsening at night or when lying down raises concern for heart/lung disease
Recent activity	No exercise required — fear alone	Follows only mild exercise, or far outlasts what activity should produce

Nine causes of excessive panting in dogs

Each cause includes typical presentation, distinguishing features, what to watch for, and an urgency rating (routine within a week / same-day vet / emergency now).

1. Anxiety, fear or stress

Anxiety panting is usually tied to a recognisable event — being left alone, loud noises, travel, unfamiliar places or a frightening past experience. It often comes with pacing, trembling, drooling, tucked tail, pinned-back ears, hiding, barking, whining or destructive behaviour. Separation-anxiety signs can begin the moment the owner leaves; noise phobia clusters around storms or fireworks. Mild anxiety panting should improve once the trigger passes and the dog settles. It should not come with pale, blue or brick-red gums, collapse, or visible breathing effort.

Watch for: whether episodes are always trigger-linked, whether the dog recovers fully afterwards, and whether triggers are becoming broader or more intense.

Urgency: routine within a week if recurrent or worsening; same-day or emergency if you cannot link episodes to a trigger or any red flag appears. For training and management, see the dog anxiety symptoms guide and separation anxiety guide.

2. Heatstroke and overheating

Heat illness in UK dogs is not confined to very hot days or parked cars. PDSA and the RSPCA warn that cars can reach about 47°C within an hour even when it is only 22°C outside. RVC VetCompass research shows that most UK heatstroke cases occur from May to August, and exercise is a major trigger. Early signs are heavy panting, fast or difficult breathing, drooling and lethargy. Progression to bright-red or very pale gums, shaking, weakness, collapse, confusion, vomiting or diarrhoea is deeply concerning. Flat-faced (brachycephalic) dogs, overweight dogs and thick-coated breeds are at higher risk.

Watch for: failure to stop panting once activity has stopped, especially if the dog seems hot, distressed or wobbly.

Urgency: emergency now. Treat any suspected heatstroke as a veterinary emergency, whether it followed a hot walk, a stuffy room, a car or simply sitting outside in warm weather.

3. Pain

Pain is a common reason for unexplained panting, and owners do not need a stethoscope to suspect it. Orthopaedic pain often comes with stiffness after rest, limping, slowing down on walks, reluctance to jump or climb stairs, or licking around a painful joint. Abdominal pain may show as a hunched back, "prayer position", yelping when picked up, vomiting, diarrhoea or restlessness. Dental pain shows up as drooling, chewing oddly, reduced appetite, mouth sensitivity or visibly wobbly teeth. Pain panting is easy to mistake for anxiety because the dog may pace, look worried and struggle to settle — the clue is that it is not tied to a fear trigger and often accompanies other signs of discomfort.

Watch for: change from your dog's normal posture, appetite, movement or willingness to be touched.

Urgency: same-day vet. If there is severe abdominal pain, collapse or a bloated abdomen, that escalates to emergency now (see GDV in the red-flag list).

4. Cardiac causes

Heart disease can cause panting, but owners usually see more than panting alone. PDSA and RVC guidance emphasise cough, breathlessness, reduced exercise tolerance, weakness, collapse or fainting, and sometimes abdominal swelling. In mitral valve disease, progression toward congestive heart failure often shows as faster breathing at rest, breathlessness, coughing and not coping as well on walks. Blue Cross notes that heart-related cough may worsen at night or when lying down — a "resting or night-time" pattern very different from straightforward anxiety.

Watch for: reduced stamina, new cough, faster breathing while asleep or resting, fainting episodes, or a distended abdomen.

Urgency: same-day vet. Struggling to breathe, blue or very pale gums, or collapse → emergency now. Respiratory distress can develop rapidly once fluid builds around or within the lungs.

5. Respiratory causes

Upper-airway obstruction and chest disease often announce themselves with noise as much as with rate. In flat-faced dogs, BOAS commonly causes noisy breathing, snoring, panting at rest, exercise intolerance, struggling in hot weather, collapse and blue discolouration in severe cases. Kennel cough classically causes a forceful, hacking cough that sounds as if something is stuck in the throat. More serious lower-airway problems — pneumonia, pulmonary oedema — shift the picture toward fast breathing, obvious effort, inability to settle, neck extension, weakness and poor tolerance of even mild movement. Laryngeal paralysis is especially suspicious in an older large-breed dog with inspiratory noise, voice change, heat intolerance and worsening on excitement or exercise.

Watch for: any noisy breathing, visible effort, or recurrence after very mild exertion.

Urgency: same-day vet, but emergency now if there is neck extension, blue gums, collapse or marked effort to breathe.

6. Cushing's syndrome (hyperadrenocorticism)

Cushing's is one of the classic medical causes of chronic "why is my dog always panting?" questions. The pattern is usually not sudden panic but a gradual cluster of signs: drinking and urinating more, a pot-bellied shape, increased appetite, hair loss or thin coat, thin or scaly skin, slow healing, muscle wastage, low energy and more panting than usual. Dogs often look older and less fit rather than acutely distressed — the opposite of a single thunderstorm or owner-departure episode.

Watch for: weeks-to-months of change rather than one dramatic day, and the combination of panting with thirst, urination and body-shape change.

Urgency: routine within a week if your dog is otherwise stable. It needs veterinary work-up (blood tests, ACTH stimulation), not emergency first aid. If a dog with suspected or known Cushing's has acute breathing trouble, collapse or severe weakness, treat that episode on its own merits and seek urgent care sooner.

7. Anaemia

Anaemia reduces oxygen delivery, so affected dogs may pant or breathe faster simply because the body is trying to compensate. The most useful owner clue is gum colour: pale-pink, white, grey or yellow-tinged gums are abnormal, and PDSA notes that blue or purple gums point to major breathing or circulation trouble. Dogs with severe anaemia may also look weak, tired, uninterested in food, wobbly or collapsed. Unlike anxiety panting, anaemia tends to make the whole dog look "flat" rather than frightened. Anaemia is a sign, not a final diagnosis — causes range from internal bleeding to immune-mediated destruction of red blood cells.

Watch for: pale gums, weakness, collapse, dark urine, jaundice (yellow tint to gums or whites of eyes).

Urgency: emergency now if gums are pale, white or grey, the dog is weak or collapsing, or panting is accompanied by obvious illness.

8. Medication side effects

Newly started medication is an important clue. PDSA lists panting as a common steroid (corticosteroid) side effect, especially alongside increased thirst, hunger, low energy and longer-term pot-belly or muscle weakness. After surgery or sedation, panting may reflect pain, discomfort, dysphoria or a paradoxical reaction. UK product information also records agitation with buprenorphine in dogs, and paradoxical excitation with diazepam in some dogs.

Watch for: "Did this start after the medicine?" and "Is the dog otherwise comfortable and breathing normally between episodes?"

Urgency: same-day vet. Do not alter or stop prescribed medicines without veterinary advice. Call the prescribing practice promptly if panting is new, marked, or paired with weakness, collapse or genuine breathing difficulty.

9. Post-exercise panting

Panting after exertion is normal — dogs use panting to lose heat. Mild exercise on a warm day can make this very obvious. What matters is the recovery pattern. Normal post-exercise panting should steadily settle once exercise stops and the dog returns to its usual behaviour. The moment it stops looking normal is when the dog is breathing very heavily, cannot stop panting, looks weak or distressed, shows bright-red or very pale gums, or the episode followed only minimal exercise. Dogs with BOAS, heart disease, laryngeal paralysis or poor fitness may decompensate after activity much more quickly than owners expect.

Watch for: duration, severity, noise, gum colour, and whether the dog wants to lie down but still cannot settle.

Urgency: same-day vet if recovery is unusually slow, the bout followed only mild activity, or any red flag is present. Heatstroke signs make it emergency now.

Where to go in the UK — routing your call

If your dog is breathing comfortably, has no red flags, and the panting is clearly mild anxiety linked to a known trigger that settles, contact your own vet for a routine appointment if episodes are recurrent or worsening.

If you suspect a medical cause, call your own vet the same day while they are open. The RCVS requires every UK practice to ensure 24-hour emergency first aid and pain relief are available, but arrangements vary — check in advance who provides your out-of-hours cover.

Charity-funded help if you're on a low income

• PDSA — free Pet Hospital treatment for one pet per household if you live in catchment and receive Housing Benefit, Council Tax Support/Reduction, or Universal Credit with a housing element. Low-cost treatment covers some additional groups. PDSA also provides stabilising care and pain relief in life-threatening emergencies regardless of eligibility. Use PDSA's eligibility checker to find your nearest service.
• Blue Cross — veterinary care if you live in catchment of a Blue Cross animal hospital (London or Grimsby) and receive a qualifying benefit (Universal Credit; income-based JSA; income-related ESA; Pension Credit; Housing Benefit with no other benefit; Council Tax Reduction with no other benefit; or State Pension).
• RSPCA — qualifying benefits include Income Support, income-based JSA, income-related ESA, Pension Credit, and Universal Credit (means-tested element). Branch criteria vary. RSPCA advises contacting your vet first, then using the "Find Your Local RSPCA" tool to filter for veterinary care or financial assistance.

What you'll typically pay (UK 2026)

Indicative figures from published UK practice pages — broad planning numbers, not a tariff. The RCVS requires practices to discuss likely charges so owners can give informed consent.

• Routine daytime first-opinion consultation: roughly £52-£65 at example UK chain practices
• Urgent or out-of-hours consultation: around £130-£218 at some 24-hour or linked emergency providers
• Late-night or dedicated emergency centre: roughly £315-£410, before diagnostics, oxygen, imaging, medication or hospitalisation

Many UK first-opinion practices close around 18:00-19:00 on weekdays and hand over to an emergency provider until the next morning, with continuous cover at weekends and bank holidays.

If you've ruled out medical causes — what to do about anxiety panting

Once a vet has ruled out medical causes, anxiety panting is treated like any other anxiety symptom: identify the trigger, build a desensitisation plan, layer in calming products if needed, and escalate to medication for severe cases.

• Start with the dog anxiety symptoms guide to confirm what you're seeing fits an anxiety pattern
• For trigger-specific support: separation anxiety, fireworks anxiety, car anxiety, thunderstorm phobia
• For calming products and ingredients with published evidence: natural calming options overview, L-theanine for dogs, UK calming chews compared
• For severe or chronic anxiety where supplements aren't enough: the UK dog anxiety medication guide covers what your vet can prescribe (SSRIs like fluoxetine, situational medication like Sileo)

One last thing worth saying: if you're not sure whether the panting is anxiety or something medical, the cost of a vet visit is much lower than the cost of missing a treatable medical cause. When in doubt, get the dog seen.