Dr. Tiffany Delacruz, DVM • Chief Executive Officer, RexVet • 2026-06-28 • 10 min read
Dog Excessive Panting: Heat, Pain, Anxiety or Heart? A FL, NY & VA Vet Guide
Heavy panting in dogs has 6 real causes — heat, pain, anxiety, heart disease, Cushing's, and respiratory issues. A licensed DVM helps Florida, New York, and Virginia owners tell which.
Medically reviewed by Dr. Tiffany Delacruz, DVM
Heavy panting in dogs is one of the most common things pet parents notice and one of the most commonly dismissed as 'just hot' or 'just excited.' Sometimes that's right. Other times it's the first sign of something serious. This guide is written for dog parents in Florida, New York, and Virginia. It walks through when panting is normal, the 6 real pathologic causes, and how to tell which.
When panting is normal
- After exercise — dogs cool through panting since they don't sweat through skin
- In hot or humid weather
- When excited or stimulated
- Brief panting after a stressful event (vet visit, fireworks)
- Brachycephalic breeds (Bulldogs, Pugs, French Bulldogs) pant more than average
When panting is NOT normal
- Panting at rest, in cool conditions, with no obvious trigger
- Panting at night, especially worsening night-by-night
- Panting + coughing
- Panting + reluctance to exercise
- Panting + restless behavior, can't settle
- Sudden onset heavy panting
- Panting + pale, blue, or grey gums (emergency)
The 6 real causes
- Heat stress / heatstroke — body temperature above 105°F. Lethargy + drooling + collapse follows. Hot pavement, parked cars, no shade. Emergency.
- Pain — orthopedic (arthritis flare, IVDD, ACL tear), dental (abscess), abdominal (pancreatitis, bloat). Often subtle but resolves dramatically with pain meds.
- Anxiety — fireworks, thunderstorms, separation, generalized. Often situational but can be chronic.
- Congestive heart failure — especially senior small breeds. Panting + cough + exercise intolerance is classic.
- Cushing's disease — excess cortisol. Panting + thirst + pot belly + hair loss + panting at night.
- Respiratory disease — laryngeal paralysis (senior labs especially), tracheal collapse (toy breeds), brachycephalic airway syndrome (Bulldogs, Frenchies).
Red flags — ER NOW
- Blue, purple, or grey gums — cyanosis (lack of oxygen)
- Collapse
- Body temperature over 105°F — heatstroke
- Severe distress + open-mouth breathing + can't lie down
- Distended abdomen + panting + retching — possible bloat (large breeds)
- Honking, gagging respiratory noise — possible laryngeal paralysis or tracheal obstruction
Working through the diagnosis
- Resting respiratory rate — count breaths/minute when sleeping. Normal: under 30. Heart failure: over 40 sustained.
- Body condition + skin: pot belly + thin skin + sparse coat = think Cushing's
- Gum color: pink = good. Pale, blue, or grey = emergency.
- Listen for cough especially at night or after lying down — heart failure indicator
- Note pattern: situational (anxiety, post-exercise) vs. constant (cardiac, Cushing's, pain)
Standard workup for unexplained panting
- Physical exam + auscultation (heart, lungs)
- Chest x-rays — heart size, pulmonary edema, masses
- Bloodwork (CBC, Chem) — kidney, liver, electrolytes
- T4 — rules out hyperthyroidism (rare in dogs)
- Cardiac workup if indicated: NT-proBNP, echocardiogram
- Adrenal function tests for suspected Cushing's: low-dose dex suppression or ACTH stim
- Imaging for suspected respiratory disease
Treatment by cause
- Heat: cool immediately (NOT ice water), get to ER for IV fluids if collapsed
- Pain: NSAIDs (Carprofen, Galliprant) or gabapentin or both
- Anxiety situational: Sileo, gabapentin, trazodone, before triggers
- Anxiety chronic: fluoxetine (SSRI) + behavior modification
- CHF: furosemide + pimobendan + ACE inhibitor; cardiology referral
- Cushing's: Vetoryl (trilostane)
- Laryngeal paralysis: surgery (tie-back) is curative if severe
Florida: heatstroke is a real risk
Florida dogs face heatstroke risk 6+ months/year. Hot pavement, parked cars, exercise in midday. Brachycephalic breeds especially vulnerable. ANY FL dog with sudden heavy panting + lethargy + drooling on a hot day should be treated as heatstroke until proven otherwise.
New York: cardiac patterns in city dogs
NYC senior small-breed dogs often present with heart failure as primary cause of panting. Apartment-confined dogs may mask exercise intolerance. NY dog parents should monitor sleeping respiratory rate weekly for senior small dogs.
Virginia: tick disease + cardiac overlap
VA Lyme disease can cause kidney involvement that leads to fluid retention and panting. Tick screen + cardiac workup together for VA dogs with new panting + outdoor exposure history.
How telehealth fits
$64.99 RexVet video visits with FL/NY/VA-licensed vets work well for: anxiety management (SSRI prescriptions, behavior coaching), Cushing's management (Vetoryl refills), cardiac maintenance (furosemide, pimobendan refills), pain management (NSAID, gabapentin refills), and triaging whether new panting needs in-person workup. Acute heatstroke and undiagnosed severe panting need in-person ER.
Emergency signals
When to contact a veterinarian
- Blue, purple, or grey gums — cyanosis emergency
- Collapse
- Body temperature over 105°F — heatstroke
- Severe distress with inability to lie down or breathe normally
- Distended abdomen + retching — bloat
- Honking, gagging respiratory noise
- Panting + coughing at night — possible heart failure
Frequently asked questions
Why is my dog panting so much?
Normal: after exercise, in heat, when excited. Abnormal: at rest in cool conditions, at night, with cough or restless behavior, or with pale gums. The 6 main pathologic causes are heatstroke, pain, anxiety, heart failure, Cushing's, and respiratory disease.
Can a RexVet online vet help with my dog's panting?
Yes for: anxiety management (SSRIs, situational meds), Cushing's management (Vetoryl), chronic cardiac maintenance (furosemide, pimobendan), pain management (NSAIDs, gabapentin), and triage. Acute respiratory distress, suspected heatstroke, or undiagnosed cardiac/respiratory causes need in-person evaluation.
When is panting an emergency?
Blue, purple, or grey gums. Collapse. Body temp over 105°F. Severe distress with open-mouth breathing and inability to lie down. Distended abdomen + retching (bloat). Honking respiratory noise (laryngeal paralysis or obstruction). Drive to ER.
How do I know if my dog has heart failure?
Classic triad: panting at rest + cough (especially at night) + exercise intolerance. Senior small-breed dogs (Cavalier King Charles Spaniels, Chihuahuas, Yorkies, Pomeranians) are highest risk. Resting respiratory rate over 40/minute while sleeping is concerning. Chest x-rays and cardiac bloodwork confirm.
Is panting always a sign something is wrong?
No. Normal panting cools the dog after exercise, in heat, or with excitement. Concerning panting is at rest in cool conditions, at night, or paired with other signs (cough, restless, pale gums, exercise intolerance, weight changes, thirst changes).
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About the author
Dr. Tiffany Delacruz, DVM
Chief Executive Officer, RexVet
Licensed veterinarian and CEO of RexVet (Rex Vets Inc.). Practicing across Florida, New York, and Virginia via licensed telehealth. Reviews every clinical article on RexVet before publication.