What Causes Reverse Sneezing in Dogs?

What Is Reverse Sneezing in Dogs?

Reverse sneezing — medically known as paroxysmal respiration or the pharyngeal gag reflex — is a sudden, involuntary respiratory event where a dog rapidly pulls air into the nose rather than expelling it outward like a normal sneeze. During an episode, your dog will typically extend their neck, flare their elbows, and produce a loud, repetitive snorting or honking sound that can last anywhere from a few seconds to over a minute.

According to the Merck Veterinary Manual, reverse sneezing is extremely common, particularly in small and brachycephalic breeds, and is generally considered benign. Most veterinary behaviorists and internists estimate that a significant percentage of small-breed dogs will experience at least one episode in their lifetime. The condition itself is not a disease but rather a reflexive response to irritation or inflammation of the nasopharynx — the area at the back of the nasal cavity above the soft palate.

While the sound can be alarming to witness — many owners describe it as sounding like their dog is choking or struggling to breathe — a true reverse sneeze is self-limiting and resolves without intervention. That said, understanding what causes reverse sneezing in dogs matters because frequent or worsening episodes can sometimes point to an underlying condition that does need veterinary attention.

What Causes Reverse Sneezing in Dogs?

The underlying mechanism is irritation or spasm of the soft palate and throat tissues. But what specifically triggers that irritation varies considerably. Here is a breakdown of the most well-documented causes and contributing factors:

Environmental Irritants

• Perfumes, air fresheners, and cleaning products — aerosolized chemicals directly irritate the nasopharyngeal mucosa
• Dust, pollen, and mold spores — seasonal allergens are among the most common triggers, particularly in spring and fall
• Cigarette or vape smoke — secondhand smoke causes chronic nasal inflammation
• Household dust from vacuuming or sweeping — particulate matter suspended in air
• Strong cooking odors or smoke — particularly from frying or broiling

Physical and Behavioral Triggers

• Pulling on a leash — pressure against the trachea and throat from a collar can stimulate the reflex
• Excitement or rapid breathing — sudden arousal causes quick inhalation that irritates the soft palate
• Eating or drinking too quickly — kibble fragments or water can contact the nasopharynx
• Temperature changes — moving from warm indoor air to cold outdoor air (or vice versa)
• Neck pressure from collars — especially in small breeds with delicate tracheal structures

Medical and Anatomical Causes

• Elongated soft palate — common in brachycephalic breeds; excess tissue partially obstructs the airway and is easily irritated
• Nasal mites (Pneumonyssoides caninum) — tiny parasites living in the nasal passages that cause chronic irritation; more common in some regions and in dogs with outdoor exposure
• Upper respiratory infections — bacterial or viral infections inflame nasal and throat tissues
• Allergies (atopic dermatitis with respiratory involvement) — chronic allergic inflammation sensitizes the nasopharynx
• Nasal polyps or tumors — growths in the nasal cavity or nasopharynx physically irritate tissues; more concerning in older dogs
• Foreign bodies — grass awns (foxtails), seed pods, or small objects lodged in the nasal passage
• Dental disease — tooth root abscesses, particularly of the upper carnassial teeth, can extend inflammation into the nasal cavity
• Tracheal collapse — while technically a separate condition, it can produce similar sounds and co-occur with reverse sneezing

Symptoms Checklist: Recognizing Reverse Sneezing and Severity Levels

Not every snorting episode is a simple reverse sneeze. Use this checklist to assess what you're observing and determine whether the situation calls for home monitoring or a veterinary visit.

Which Dog Breeds Are Most Prone to Reverse Sneezing?

While any dog can experience reverse sneezing, certain breeds and body types are predisposed due to their anatomy. Understanding breed risk helps you contextualize whether an episode is an expected quirk or something more concerning.

According to the American Kennel Club, reverse sneezing is so common in small breeds that many veterinarians consider it a normal breed trait rather than a medical concern — provided episodes remain brief and the dog is otherwise healthy.

How Is Reverse Sneezing Diagnosed?

In most cases, reverse sneezing is diagnosed by description alone. Your veterinarian will ask you to describe the episodes — or ideally, show a video recording — and will perform a physical exam. For typical, infrequent episodes in a predisposed breed with no other symptoms, this may be all that's needed.

However, if episodes are frequent, worsening, or accompanied by other symptoms, your vet may recommend additional diagnostics to rule out underlying conditions. Here is the typical diagnostic progression:

Step 1: Physical Examination and History

Your vet will palpate the neck and throat, auscultate (listen to) the heart and lungs, examine the oral cavity and soft palate, and check the nostrils for discharge or asymmetry. They will also ask detailed questions about frequency, duration, triggers, and any concurrent symptoms. Cost: $50–$90 (standard exam fee).

Step 2: Video Review

A smartphone video of an episode is one of the most valuable diagnostic tools. The characteristic posture and sound of a reverse sneeze are usually distinctive enough to differentiate it from coughing, choking, tracheal collapse, or cardiac-related respiratory distress. Cost: Included in exam.

Step 3: Advanced Diagnostics (If Indicated)

If the initial exam raises concerns, your vet may recommend:

In my experience working with dog owners, the vast majority of reverse sneezing cases never progress beyond Step 1 and Step 2. Advanced diagnostics are typically reserved for dogs with atypical presentations — older dogs with sudden onset, dogs with nasal discharge or facial changes, or dogs whose episodes are increasing in severity despite trigger management.

Treatment Options: Can Reverse Sneezing Be Cured?

Because reverse sneezing is a reflex rather than a disease, "cure" isn't quite the right framework. Instead, treatment focuses on reducing episode frequency by managing triggers and addressing any underlying causes. For most dogs, no medical treatment is necessary.

Important: Never administer over-the-counter human medications to your dog without explicit veterinary guidance. Dosages for dogs differ significantly from human doses, and some common human medications are toxic to dogs. Always consult your veterinarian before starting any medication.

What to Do During a Reverse Sneezing Episode

While most episodes resolve on their own within seconds, there are several gentle techniques you can use to help shorten an episode and keep your dog calm:

1. Stay calm. Your anxiety transfers to your dog. Speak in a soft, reassuring voice.
2. Gently massage the throat. Lightly stroke the front of your dog's neck in a downward motion. This can encourage swallowing, which resets the soft palate.
3. Briefly cover the nostrils. Placing your hand gently over both nostrils for 1–2 seconds forces the dog to swallow and open their mouth, which often stops the spasm. Release immediately if the dog resists.
4. Offer a small amount of water. If your dog is willing, offering water can trigger swallowing and clear the irritation.
5. Change the environment. Move to a different room or step outside — a change in air temperature or humidity can interrupt the reflex.
6. Use a calming cue. If your dog knows a "sit" or "touch" cue, gently asking for a trained behavior can redirect their breathing pattern. Always use positive reinforcement — reward with a treat after the episode passes.

Prognosis and Life Expectancy

For the overwhelming majority of dogs, reverse sneezing has no impact on life expectancy or quality of life. It is a benign reflex that may occur intermittently throughout a dog's life without causing any damage to the respiratory system.

Cost of Diagnosis and Treatment

Because most reverse sneezing cases require minimal intervention, the typical cost burden is low. However, costs escalate when advanced diagnostics or surgical treatment are needed.

Pet insurance can significantly offset these costs if enrolled before symptoms appear. Most comprehensive policies cover diagnostic imaging and surgical procedures, though pre-existing conditions are universally excluded. If your dog is a breed predisposed to airway issues, enrolling in a policy during puppyhood is a financially sound decision.

Prevention and Long-Term Management

While you can't eliminate the reflex entirely, you can meaningfully reduce how often your dog experiences reverse sneezing episodes:

Environmental Modifications

• Switch to a harness. A front-clip or back-clip harness removes all pressure from the neck and trachea during walks. This single change is often the most impactful adjustment for dogs whose episodes are triggered by leash pulling.
• Reduce airborne irritants. Avoid using aerosol sprays, scented candles, plug-in air fresheners, and strong cleaning products near your dog. If you must use them, ensure good ventilation and keep your dog in another room until the air clears.
• Use a HEPA air purifier. Placing one in the room where your dog spends the most time can reduce dust, pollen, and dander levels. Look for units rated for your room's square footage — for a 300 sq ft living room, a unit with a Clean Air Delivery Rate (CADR) of at least 200 is effective.
• Manage humidity. Dry indoor air (especially in winter with forced-air heating) dries and irritates nasal passages. A humidifier maintaining 40–50% relative humidity can help.
• Eliminate smoke exposure. If anyone in the household smokes or vapes, doing so outside and away from the dog's environment significantly reduces airway irritation.

Feeding Adjustments

• Use a slow-feeder bowl. If episodes are triggered by rapid eating, a slow-feeder bowl (such as the Outward Hound Fun Feeder or the Kong Wobbler) slows intake and reduces the chance of kibble fragments contacting the nasopharynx.
• Elevate food and water bowls. For small breeds, raising bowls 4–6 inches off the floor can reduce the angle at which food and water enter the throat.
• Moisten dry food. Adding a small amount of warm water or low-sodium broth to kibble softens it and reduces dust and fine particles.

Health Maintenance

• Maintain a healthy weight. Excess body fat adds tissue around the throat and worsens airway narrowing. Work with your vet to determine your dog's ideal body condition score (BCS) — for most breeds, a BCS of 4–5 on a 9-point scale is ideal.
• Keep up with dental care. Regular tooth brushing (daily is ideal, 3–4 times per week minimum) and annual veterinary dental cleanings prevent the tooth root infections that can extend into the nasal cavity.
• Manage allergies proactively. If your dog has diagnosed environmental allergies, consistent treatment (whether with antihistamines, Apoquel, Cytopoint injections, or allergen-specific immunotherapy) reduces nasopharyngeal inflammation and secondary reverse sneezing.
• Annual wellness exams. Regular check-ups allow your vet to monitor for early signs of dental disease, nasal changes, or weight gain that could increase reverse sneezing frequency.

Reverse Sneezing vs. Other Conditions: Know the Difference

One of the most common reasons owners seek emergency care for reverse sneezing is confusion with more serious conditions. Here is how to distinguish them:

Frequently Asked Questions

Is reverse sneezing painful for my dog?

No. While the sound and posture look dramatic, reverse sneezing is not painful. Dogs do not experience discomfort during or after a typical episode. If your dog appears to be in pain — pawing at the face, whining, or resisting touch around the head and neck — that suggests a different condition, such as a dental abscess or foreign body, and warrants a veterinary visit.

Can reverse sneezing cause brain damage or oxygen deprivation?

No. A typical reverse sneezing episode, even one lasting a full minute, does not cause oxygen deprivation or any neurological harm. The dog continues to exchange air during the episode, just through a different pathway and pattern than normal breathing. Cyanosis (blue gums) is not a feature of simple reverse sneezing and, if observed, indicates a different, more serious emergency.

My dog only reverse sneezes at night — is that normal?

Nighttime reverse sneezing is often related to environmental factors in the sleeping area: dust mites in bedding, dry air from heating vents, or lying in a position that puts pressure on the nasopharynx. Try washing bedding weekly in hot water, running a humidifier in the bedroom, and ensuring your dog's sleeping area is well-ventilated. If nighttime episodes persist or worsen, mention it to your vet, as post-nasal drip from allergies can also be more pronounced when lying down.

Should I be worried if my puppy reverse sneezes?

Reverse sneezing in puppies is common and usually benign, especially in small and brachycephalic breeds. However, puppies are also more susceptible to upper respiratory infections (including kennel cough and canine influenza) and foreign body inhalation from their exploratory chewing habits. If your puppy's reverse sneezing is accompanied by nasal discharge, lethargy, reduced appetite, or fever (rectal temperature above 103.5°F / 39.7°C), schedule a veterinary appointment promptly.

Can I give my dog Benadryl for reverse sneezing?

Diphenhydramine (Benadryl) is sometimes used in veterinary medicine for allergic reactions, and your vet may recommend it if allergies are contributing to your dog's reverse sneezing. However, the correct canine dosage is weight-dependent — typically 1 mg per pound of body weight, given every 8–12 hours — and it is not appropriate for all dogs. Some formulations contain xylitol or additional active ingredients that are toxic to dogs. Always consult your veterinarian before administering any medication.

Does reverse sneezing get worse as dogs age?

For most dogs with idiopathic reverse sneezing, episode frequency remains relatively stable throughout life. However, in brachycephalic breeds, progressive airway changes associated with BOAS can worsen symptoms over time. Additionally, new-onset or worsening reverse sneezing in a senior dog (over 8–10 years) should be evaluated for age-related conditions such as nasal tumors, dental disease, or laryngeal paralysis.