Dog Reverse Sneezing Cover One Nostril
Reverse sneezing, medically termed paroxysmal respiration or inspiratory paroxysmal respiration, is a common and often alarming clinical event observed in dogs. While the sound can mimic a choking episode or a respiratory crisis, the condition is typically benign and self-limiting. One of the most widely recommended first-aid techniques to abort an episode is the manual occlusion of one nostril. This pillar article provides an exhaustive, evidence-informed review of the "cover one nostril" method, its physiological basis, step-by-step execution, differential diagnoses, and when professional veterinary intervention is required.
Quick Q&A
Question: How do I stop my dog's reverse sneezing by covering one nostril?
Answer: Gently place your thumb or finger over one of your dog's nostrils, sealing it closed for 2 to 5 seconds while keeping the mouth closed. This forces the dog to inhale through the open nostril, which often breaks the spasm of the soft palate and stops the reverse sneeze. If the episode does not resolve within 30 to 60 seconds, or if it recurs frequently, consult your veterinarian.
Understanding Reverse Sneezing: Pathophysiology and Clinical Presentation
Reverse sneezing is characterized by a sudden, forceful, and repeated inspiratory effort, producing a honking, snorting, or gagging sound. Unlike a standard sneeze (which expels air outward), a reverse sneeze draws air inward rapidly through the nasal passages.
The Role of the Soft Palate and Pharynx
The primary anatomical structures involved are the soft palate and the nasopharynx. In many dogs, particularly brachycephalic (short-nosed) breeds, the soft palate is elongated relative to the pharyngeal cavity. During excitement, inhalation of an irritant (dust, pollen, perfume), or rapid drinking, the soft palate can become transiently sucked against the laryngeal opening. This creates a negative pressure vacuum, causing the palate to flutter and spasm. The dog then attempts to inhale against this partial obstruction, producing the characteristic inspiratory noise.
Why the "Cover One Nostril" Technique Works
The manual occlusion of one nostril is a simple biomechanical intervention. By blocking one nasal passage, you force the dog to increase the velocity and pressure of airflow through the remaining open nostril and the pharynx. This higher pressure airflow physically pushes the soft palate back into its normal resting position, breaking the spasm. The technique is analogous to the "Valsalva maneuver" used in human medicine to abort certain cardiac arrhythmias, though the mechanism here is purely mechanical.
Step-by-Step Clinical Method: Covering One Nostril
This technique is considered a safe, non-invasive first-line intervention. It is endorsed by many veterinary emergency and primary care guidelines, including those referenced by VCA Animal Hospitals and DVM360.
Step 1: Confirm the Event is Reverse Sneezing
Before applying the technique, ensure the dog is not choking or experiencing a true respiratory emergency. Signs of reverse sneezing include:
- A sudden, repetitive inspiratory snort or honk.
- The dog stands still with elbows abducted (pointing outward) and neck extended.
- The dog appears alert and conscious, not cyanotic (blue gums).
- The episode typically lasts 10 to 30 seconds.
Differentiation from choking: A choking dog will paw at the mouth, have a panicked expression, show cyanosis, and may collapse. Do not perform the nostril occlusion technique on a choking dog.
Step 2: Position the Dog
Calmly approach the dog. Speak in a soothing tone. If the dog is standing, allow it to remain standing. If it is lying down, gently encourage it to sit or stand. Do not restrain the dog forcefully, as stress can prolong the episode.
Step 3: Occlude One Nostril
Using your thumb or index finger, gently press against the side of the dog's muzzle to seal one nostril completely. Use your other hand to gently hold the dog's mouth closed. Maintain this seal for 2 to 5 seconds.
Step 4: Release and Observe
Release the nostril and allow the dog to breathe normally. In most cases, the reverse sneeze will stop immediately or within 5 seconds. If the episode continues, you may repeat the technique once more.
Step 5: Offer Water and Reassurance
After the episode resolves, offer the dog a small amount of cool, fresh water. Gently massaging the dog's throat (over the laryngeal area) can also help relax the pharyngeal muscles. Monitor the dog for 10 to 15 minutes to ensure the episode does not recur.
Alternative and Adjunctive Techniques
While the "cover one nostril" method is the most common, other techniques may be used if the primary method fails or if the dog is resistant.
Gag Reflex Induction
Gently inserting a finger into the dog's mouth to stimulate a gag reflex can sometimes break the spasm. This is more invasive and carries a risk of being bitten, so it should only be performed by experienced individuals.
Brief Nostril Pinch (Both Nostrils)
Some veterinarians recommend briefly pinching both nostrils shut for 1 to 2 seconds, then releasing. This forces the dog to open its mouth to breathe, which can reposition the soft palate. However, this method is more stressful and should be used cautiously in brachycephalic breeds.
Environmental Modification
If reverse sneezing is triggered by allergens (pollen, dust mites, mold), using a high-efficiency particulate air (HEPA) purifier in the home can reduce frequency. For dogs with seasonal allergies, antihistamines (under veterinary guidance) may be helpful.
Differential Diagnoses: When It Is Not Reverse Sneezing
It is critical to distinguish reverse sneezing from other respiratory conditions that require immediate medical attention.
Tracheal Collapse
Common in small breed dogs (Yorkshire Terriers, Pomeranians, Chihuahuas), tracheal collapse produces a "goose honk" cough that is expiratory, not inspiratory. The cough is often triggered by excitement, pulling on a leash, or drinking water. Radiographs or fluoroscopy are needed for diagnosis. Management includes weight control, harness use (not collars), and sometimes surgical stenting.
Brachycephalic Obstructive Airway Syndrome (BOAS)
In breeds like Bulldogs, Pugs, and Boston Terriers, reverse sneezing can be a component of BOAS. However, BOAS also includes stertor (noisy breathing), exercise intolerance, and potential cyanosis. Dogs with severe BOAS may require surgical correction (e.g., soft palate resection, nares correction). The "cover one nostril" technique may be less effective in these dogs due to underlying anatomical narrowing.
Foreign Body or Mass
A persistent, unilateral nasal discharge, sneezing, or reverse sneezing that does not respond to the nostril occlusion technique may indicate a nasal foreign body (grass awn, foxtail) or a nasal tumor. Rhinoscopy is the gold standard for diagnosis. In Australia, grass awns (e.g., Hordeum species) are a common cause of nasal foreign bodies, while in North America, foxtails (Setaria species) are prevalent.
Respiratory Infections
Bacterial, viral (e.g., canine influenza, distemper), or fungal (e.g., Aspergillus spp.) infections can cause nasal irritation and reverse sneezing. Accompanying signs include mucopurulent discharge, fever, lethargy, and reduced appetite. Diagnostic testing includes PCR panels, culture, and serology.
When to Seek Veterinary Care
While occasional reverse sneezing is normal, certain red flags warrant a veterinary visit.
Frequency and Duration
- More than 2 episodes per week.
- Episodes lasting longer than 60 seconds.
- Clusters of episodes occurring over several hours.
Associated Clinical Signs
- Cyanosis (blue or purple gums/tongue).
- Collapse or syncope (fainting).
- Lethargy, anorexia, or weight loss.
- Nasal discharge (unilateral or bilateral, clear or purulent).
- Ocular discharge or epiphora (excessive tearing).
- Coughing, gagging, or retching between episodes.
Breed-Specific Considerations
- Brachycephalic breeds: Any dog with BOAS should have reverse sneezing evaluated in the context of overall airway function. The "cover one nostril" technique should be used with caution, as these dogs may have compromised airflow at baseline.
- Toy breeds: Rule out tracheal collapse and collapsing mitral valve disease, which can present with respiratory distress.
Regional Considerations in Veterinary Practice
North America (US and Canada)
According to the AVMA and AAHA, reverse sneezing is a common benign condition, but owners should be educated to differentiate it from choking. In regions with high tick populations (e.g., Lyme disease endemic areas), reverse sneezing is rarely linked to tick-borne disease, but any new respiratory sign should prompt a full examination. The CVMA emphasizes the importance of using a harness rather than a collar in small breeds to reduce tracheal pressure.
Europe
The FVE and EMA guidelines highlight the role of environmental allergens in canine respiratory health. In the UK and continental Europe, seasonal allergic rhinitis is a common trigger for reverse sneezing. European veterinarians often recommend intradermal allergy testing or serum allergen-specific IgE testing for chronic cases.
Australia
The AVA and DAFF note that grass awns (e.g., barley grass, spear grass) are a major cause of nasal foreign bodies in Australian dogs. Reverse sneezing that is unilateral, persistent, or accompanied by pawing at the face should raise suspicion for a grass awn. Radiography and rhinoscopy are frequently required. Quarantine regulations in Australia also mean that certain respiratory pathogens (e.g., canine influenza) are not endemic, so imported dogs should be screened.
References
- Merck Veterinary Manual. "Respiratory System: Paroxysmal Respiration (Reverse Sneezing)." Merck Veterinary Manual, 11th ed., Merck & Co., 2020.
- VCA Animal Hospitals. "Reverse Sneezing in Dogs." VCA Animal Hospitals, 2023.
- American Veterinary Medical Association (AVMA). "Brachycephalic Obstructive Airway Syndrome." AVMA, 2022.
- American Animal Hospital Association (AAHA). "AAHA Canine Life Stage Guidelines." AAHA, 2019.
- Canadian Veterinary Medical Association (CVMA). "Respiratory Health in Brachycephalic Breeds." CVMA Position Statement, 2021.
- Australian Veterinary Association (AVA). "Grass Awn Foreign Bodies in Dogs." AVA Clinical Guidelines, 2020.
- Federation of Veterinarians of Europe (FVE). "Environmental Allergens and Canine Respiratory Health." FVE Position Paper, 2021.
- DVM360. "How to Manage Reverse Sneezing in Dogs." DVM360, 2022.
- Cornell College of Veterinary Medicine. "Reverse Sneezing: What It Is and Why It Happens." Cornell Feline Health Center (adapted for canine), 2023.
- European Medicines Agency (EMA). "Guidelines for the Diagnosis and Management of Canine Allergic Rhinitis." EMA/CVMP, 2020.
Disclaimer: This article is for informational and educational purposes only. It does not replace professional veterinary diagnosis or treatment. If your dog is experiencing respiratory distress, seek immediate veterinary care.