# French Bulldog Health Problems: BOAS Surgery Hemivertebrae and Skin Folds ## Key Takeaways - Brachycephalic Obstructive Airway Syndrome (BOAS) in French Bulldogs is a complex of upper airway abnormalities (stenotic nares, elongated soft palate, everted laryngeal saccules, hypoplastic trachea) leading to significant respiratory compromise, with 29.6% of owners reporting breathing problems. Objective grading systems (e.g., Grades II-III) are crucial for identifying dogs requiring surgical intervention such as rhinoplasty and staphylectomy. - Hemivertebrae, a congenital vertebral malformation resulting in wedge-shaped vertebrae, are prevalent (19.0% of owners report back problems) and can cause spinal cord compression, leading to hind-limb weakness, ataxia, and incontinence, necessitating advanced imaging like MRI for definitive diagnosis and potential surgical decompression. - Skin fold infections (intertrigo) are common due to the breed's conformation, creating moist environments conducive to bacterial and yeast overgrowth; diagnosis is often clinical, supported by cytology, and treatment involves topical antimicrobials and addressing underlying allergies, with surgical resection reserved for severe, recurrent cases. - A significant disconnect exists between owner perception and objective health status, with many owners failing to recognise BOAS or other conditions, hindering timely veterinary care and potentially perpetuating breeding for extreme conformation over health. - Conservative management for BOAS includes weight control and avoiding heat stress, while hemivertebrae management focuses on activity restriction and physiotherapy; both require vigilant owner monitoring and veterinary guidance due to the progressive nature of these conditions. --- French Bulldogs are among the most popular companion dogs in the United Kingdom, Germany, the United States, and Denmark, yet their distinctive flat-faced conformation carries a heavy burden of breed-related disease [1][2][3]. For owners and veterinary professionals, the three most consequential health challenges are Brachycephalic Obstructive Airway Syndrome (BOAS), hemivertebrae, and skin fold infections. This article provides a definitive, source-grounded review of these conditions, their surgical and medical management, and the clinical evidence that should guide decision-making. **Owner Triage Summary:** If your French Bulldog has noisy breathing at rest, collapses after exercise, or has blue-tinged gums, treat this as an emergency and seek immediate veterinary care. If your [dog](/knowledge/veterinary-medicine/clinical-methods/dog) shows hind-limb weakness, scuffing of the toes, or difficulty jumping, this may indicate spinal cord compression from hemivertebrae; do not wait for signs to progress. Skin fold infections that are red, itchy, or malodorous require veterinary treatment; do not attempt to treat with over-the-counter human creams, as many contain steroids that are unsafe for dogs. ### At a Glance: The Three Major Health Problems | Condition | Prevalence / Key Data | Primary Signs | Management Options | |------|-----------|--------|----------| | **BOAS** | 29.6% of owners report breathing problems; 56% of owners believe French Bulldogs are less healthy than other breeds [1] | Stertor, exercise intolerance, cyanosis, collapse | Weight control, BOAS surgery, avoidance of heat stress | | **Hemivertebrae** | 19.0% of owners report back problems [1] | Hind-limb weakness, ataxia, urinary incontinence, kyphosis | Conservative care, surgery in severe cases | | **Skin Fold Infections** | 36% of dogs have otitis externa/media; allergies reported in 36.7% [1][2] | Erythema, pruritus, malodour, exudate in facial/tail folds | Topical and systemic therapy, surgical resection in severe cases | --- ## Understanding BOAS in French Bulldogs Brachycephalic Obstructive Airway Syndrome is not a single disease but a constellation of upper airway abnormalities that obstruct breathing. The French Bulldog's short muzzle and flat nose are the result of selective breeding for a specific facial structure, but this same structure predisposes the breed to respiratory compromise [1][2]. The condition is so common and so impactful that it is now considered a major welfare issue for the breed internationally [1][4]. ### Anatomy and Pathophysiology of BOAS In a normally proportioned dog, air travels from the nostrils through the nasal passages, pharynx, larynx, and trachea with minimal resistance. In the French Bulldog, several anatomical features conspire to narrow this airway: - **Stenotic nares:** The nostrils are pinched and narrow, reducing airflow at the very entrance of the respiratory tract. - **Elongated soft palate:** The soft palate is too long for the shortened skull, and its free edge obstructs the laryngeal opening during inspiration. - **Everted laryngeal saccules:** Chronic negative pressure within the airway pulls the saccules (small pockets of tissue just inside the larynx) outward, further narrowing the airway. - **Hypoplastic trachea:** The trachea may be narrower than normal, adding resistance throughout the conducting airways. These abnormalities create a vicious cycle. Each breath requires increased effort, which generates greater negative pressure, which in turn worsens the anatomical obstructions. Over time, this can lead to laryngeal collapse, a severe and often irreversible complication [4]. ### Clinical Signs and Owner Perception The clinical signs of BOAS are variable but typically include stertor (a low-pitched, snoring sound), increased respiratory effort, exercise intolerance, and heat intolerance. In more severe cases, dogs may show cyanosis (blue-tinged gums), syncope (fainting), or collapse after exertion. Gastrointestinal signs such as regurgitation and vomiting are also common in brachycephalic dogs, as the increased respiratory effort creates negative pressure that draws gastric contents into the oesophagus. A critical issue identified in the veterinary literature is the discrepancy between owner perception and objective health status. In a study of 89 French Bulldogs using whole-body barometric plethysmography (WBBP), 60% of owners failed to recognise BOAS in dogs that were objectively graded as having significant clinical signs [4]. This finding is echoed in survey-based research showing that 64% of owners considered their own French Bulldog to be healthier than other individuals of the same breed, despite 56% of owners acknowledging that French Bulldogs are generally less healthy than other breeds [1]. This "normalisation of abnormality" is a significant barrier to improving canine welfare, as owners who do not perceive a problem are unlikely to seek treatment or support breeding changes [1][4]. ### Objective Diagnosis: BOAS Grading The gold standard for objective assessment of BOAS is a functional grading system that evaluates respiratory signs before and after a standardised exercise test. In the research setting, this is often combined with whole-body barometric plethysmography, a non-invasive method that measures respiratory flow traces in unsedated dogs [4]. The grading system used in the study by Liu and colleagues categorises dogs as follows: - **Grade 0:** No respiratory signs at rest or after exercise. - **Grade I:** Mild respiratory signs, such as audible breathing, that do not interfere with activity. - **Grade II:** Moderate signs, with increased respiratory effort and reduced exercise tolerance. - **Grade III:** Severe signs, including cyanosis or collapse. In the research protocol, Grades 0 and I are considered BOAS-negative (BOAS-), while Grades II and III are considered BOAS-positive (BOAS+) [4]. This functional grading is increasingly advocated as a selection tool for breeding programmes, as it provides an objective measure of respiratory health that can be used to reduce the prevalence of BOAS in future generations [1]. ### BOAS Surgery: Indications and Outcomes BOAS surgery, also known as brachycephalic airway surgery, aims to relieve the anatomical obstructions. The most common procedures are: - **Rhinoplasty (nares resection):** Surgical widening of the nostrils to improve airflow at the nasal entrance. - **Staphylectomy (soft palate resection):** Trimming the elongated soft palate so that it no longer obstructs the larynx. - **Laryngeal sacculectomy:** Removal of the everted laryngeal saccules. The decision to proceed with surgery should be based on the severity of clinical signs and the results of objective BOAS grading. Dogs with Grade II or III signs are generally considered candidates for surgical intervention, particularly if they show exercise intolerance or episodes of collapse [4]. Surgical outcomes are generally favourable when the procedure is performed by an experienced veterinary surgeon, but the evidence base is limited by a lack of large, prospective, randomised trials. Owners should be aware that surgery does not "cure" BOAS; it reduces the severity of obstruction but does not change the underlying brachycephalic conformation. Post-operative care typically involves strict rest, pain management, and monitoring for complications such as swelling, aspiration pneumonia, and haemorrhage. It is also essential to manage BOAS conservatively alongside any surgical intervention. Weight management is critical, as obesity significantly worsens respiratory function. Owners should avoid exercising their dogs in hot or humid conditions, use a harness instead of a collar, and be vigilant for signs of heat stress. The survey data from Denmark and Germany indicate that many owners do not recognise the severity of their dog's respiratory compromise, so veterinary guidance is essential for appropriate management [1][2]. --- ## Hemivertebrae in French Bulldogs Hemivertebrae are congenital malformations of the vertebrae in which one half of the vertebral body fails to develop normally, resulting in a wedge-shaped or butterfly-shaped bone. This condition is particularly common in screw-tailed breeds, including the French Bulldog, and is a leading cause of neurological problems in the breed [1]. ### Pathophysiology and Clinical Presentation The abnormal shape of the hemivertebra can lead to instability of the spinal column, abnormal curvature (kyphosis or lordosis), and, most importantly, compression of the spinal cord. However, it is crucial to understand that not all hemivertebrae cause clinical signs. Many French Bulldogs have radiographic evidence of hemivertebrae but never develop neurological deficits. The condition only becomes clinically significant when the malformed vertebra or associated instability compresses the spinal cord or its blood supply. When clinical signs do occur, they typically reflect spinal cord compression in the thoracolumbar region. Owners may notice: - Hind-limb weakness or ataxia (wobbliness) - Scuffing of the toes - Difficulty jumping or climbing stairs - Urinary or faecal incontinence - Kyphosis (a hunched or curved back) - Pain on palpation of the spine The onset of signs can be gradual or sudden. In some dogs, a minor trauma can precipitate acute neurological deterioration in a spine that was previously compensated. ### Diagnosis and Prognosis Diagnosis of hemivertebrae is typically made through radiography, but advanced imaging such as computed tomography (CT) or magnetic resonance imaging (MRI) is required to assess spinal cord compression definitively. These imaging modalities allow the veterinary surgeon to determine whether the clinical signs are attributable to the hemivertebrae or to another condition, such as intervertebral disc disease, which is also common in the breed. The prognosis for dogs with hemivertebrae is highly variable. Dogs with mild signs and no evidence of significant spinal cord compression may live comfortable lives with conservative management, including activity restriction, weight management, and physiotherapy. Dogs with severe signs, particularly those with urinary incontinence or paraplegia, have a guarded prognosis and may require surgical intervention. ### Management and Surgical Considerations Conservative management of hemivertebrae focuses on reducing inflammation and preventing further injury. Strict cage rest, anti-inflammatory medication, and physiotherapy are the mainstays of treatment. However, owners must be aware that the underlying vertebral malformation remains, and there is a risk of recurrence or progression. Surgical treatment is indicated for dogs with progressive neurological signs or severe spinal cord compression. The most common procedure is a hemilaminectomy, in which the veterinary surgeon removes part of the vertebra to decompress the spinal cord. In cases of spinal instability, the surgeon may also stabilise the spine with implants. Surgery carries significant risks, including infection, haemorrhage, and worsening of neurological function, and should only be performed by a specialist in veterinary neurology or orthopaedics. The survey data from Germany reported that 19.0% of French Bulldog owners identified back problems in their dogs, underscoring the clinical importance of this condition [1]. However, the same study noted that tail malformations were reported in 98% of dogs, which suggests that vertebral abnormalities are nearly universal in the breed, even if clinical signs are not [2]. This highlights the importance of careful breeding selection to reduce the prevalence of severe vertebral malformations. --- ## Skin Fold Infections and Dermatological Disease The French Bulldog's characteristic wrinkles and skin folds are a defining feature of the breed, but they also create a warm, moist environment that is ideal for bacterial and yeast overgrowth. Dermatological problems are among the most commonly reported health issues in the breed [1][2]. ### Why Skin Folds Become Infected Skin folds are areas where two surfaces of skin rub together, creating friction, moisture, and reduced airflow. In the French Bulldog, the most problematic folds are: - **Facial folds:** The wrinkles on the face, particularly around the nose and eyes. - **Tail fold:** The deep fold beneath the screw tail, which can be particularly problematic. - **Vulvar folds:** In female dogs, the skin around the vulva can be affected. The combination of moisture, warmth, and friction disrupts the normal skin barrier, allowing commensal bacteria (such as *Staphylococcus* species) and yeast (such as *Malassezia*) to overgrow. This results in a condition known as intertrigo, or skin fold dermatitis. ### Clinical Signs and Diagnosis Owners may notice: - Redness and inflammation of the skin in the folds - A foul or yeasty odour - Moisture or exudate in the folds - Itching or rubbing of the affected area - Hair loss or crusting Diagnosis is usually straightforward based on clinical examination, but cytology (microscopic examination of skin swabs) can help identify the predominant organism and guide treatment. In chronic or recurrent cases, underlying allergies should be suspected, as these can predispose to secondary infections. ### Treatment and Prevention Treatment of skin fold infections involves a multi-pronged approach: 1. **Topical therapy:** Medicated wipes, shampoos, or creams containing chlorhexidine, miconazole, or other antimicrobial agents can be used to clean and treat the folds. These are often more effective than systemic antibiotics for localised infections. 2. **Systemic therapy:** For severe or deep infections, oral antibiotics or antifungals may be necessary. The choice of drug should be guided by culture and sensitivity testing where possible. 3. **Addressing underlying causes:** If allergies are present, they must be managed to prevent recurrence. This may involve dietary changes, allergen avoidance, or immunotherapy. 4. **Regular cleaning:** Daily cleaning of the folds with a vet-approved wipe can help prevent infections from developing. In severe, recurrent cases that do not respond to medical management, surgical resection of the affected fold may be considered. This is a significant decision, as it alters the dog's appearance, but it can dramatically improve quality of life for dogs with chronic, painful infections. The prevalence of dermatological disease in French Bulldogs is substantial. In the German survey, 52% of dogs had diagnosed or presumed hypersensitivities/allergies, and 36% had otitis externa/media [2]. Allergies were the most commonly reported health problem in the Danish survey, affecting 36.7% of dogs [1]. These figures highlight the need for proactive dermatological care in the breed. --- ## The Broader Health Picture and Owner Perceptions The three conditions discussed above do not exist in isolation. French Bulldogs are affected by a wide range of health problems, and owners must be prepared for the possibility of multiple concurrent issues. The most commonly reported problems include allergies (36.7%), breathing problems (29.6%), and back problems (19.0%) [1]. Other significant issues include otitis, ocular disorders, and gastrointestinal problems [2][3]. A striking finding across multiple studies is the disconnect between owner perception and objective health status. In one large study of 2168 owners of brachycephalic breeds, 70.9% of owners considered their dog to be in very good health or the best health possible, despite 36.5% reporting problems with heat regulation and 17.9% reporting breathing problems [5]. Furthermore, only 6.8% of owners considered their dog to be less healthy than average for their breed [5]. This perception gap has significant implications for breeding and welfare. If owners do not recognise their dogs as unhealthy, they are unlikely to demand healthier breeding practices or to avoid reacquiring the breed. Indeed, the same study found that 93.0% of owners were likely to want to own their breed again in the future, and 65.5% would recommend the breed to others [6]. The desire to reacquire was associated with a strong dog-owner relationship and first-time ownership, rather than with the dog's health status [6]. The paradox of brachycephalic ownership is that owners are drawn to the very features that cause health problems. Physical appearance is the dominant factor attracting owners to breeds like the French Bulldog [7]. This creates a welfare challenge that cannot be solved by veterinary medicine alone; it requires a shift in owner attitudes and a commitment to breeding for health rather than for extreme conformation [1][7]. --- ## Breeding and Prevention: The Path Forward The most effective way to reduce the burden of BOAS, hemivertebrae, and skin fold infections is to prevent them from occurring in the first place. This requires a fundamental change in breeding practices. The BOAS grading system described earlier is a promising tool for breeding selection. By grading breeding stock before they are used, breeders can avoid perpetuating the most severe forms of respiratory compromise. The Danish survey found that owners were generally supportive of BOAS grading as a means to improve respiratory health, suggesting that there is appetite for such measures within the owner community [1]. For hemivertebrae, breeding selection is more challenging, as the condition is common and not all affected dogs show clinical signs. However, breeders can reduce the risk by avoiding breeding dogs with significant spinal malformations or those with a history of neurological problems. Radiographic screening of breeding stock may be helpful, but it is not foolproof, as not all hemivertebrae are clinically significant. For skin fold infections, the severity of the problem is directly related to the depth and number of skin folds. Breeding for a less extreme conformation, with fewer and shallower wrinkles, would reduce the incidence of intertrigo. However, this is unlikely to happen without a change in breed standards and owner preferences. Veterinary organisations, including the AVMA, AAHA, and their international counterparts, have issued statements emphasising the welfare concerns associated with extreme brachycephalic conformation. While these organisations do not provide breed-specific guidelines, they support the principle that breeding should prioritise health and function over appearance. --- ## Limitations and When to Contact a Veterinarian This article provides a comprehensive overview of the most significant health problems in French Bulldogs, but it has limitations. The prevalence data cited are derived from specific populations (Denmark, Germany, UK) and may not be directly applicable to all regions. Furthermore, breed-level information cannot predict the health of an individual dog. Each French Bulldog is unique, and the presence or absence of a condition such as hemivertebrae or BOAS can only be determined through veterinary examination. **Contact your veterinarian immediately if your French Bulldog shows any of the following:** - Difficulty breathing, especially if the gums or tongue appear blue or pale - Collapse, fainting, or severe exercise intolerance - Sudden hind-limb weakness, paralysis, or loss of urinary control - Signs of pain, such as crying, restlessness, or reluctance to move - A red, swollen, or painful skin fold that is not improving with cleaning Do not wait to see if these signs resolve on their own. Many of the conditions described in this article are progressive, and early intervention can significantly improve the outcome. --- ## Frequently Asked Questions ### 1. What is the most common health problem in French Bulldogs? Allergies are the most commonly reported health problem, affecting 36.7% of dogs in one large survey, followed closely by breathing problems (29.6%) and back problems (19.0%) [1]. ### 2. Is BOAS surgery always necessary for French Bulldogs? No, BOAS surgery is only indicated for dogs with significant clinical signs, typically those graded as BOAS-positive (Grade II or III) on functional testing [4]. Conservative management, including weight control and avoiding heat stress, is the first line of treatment. ### 3. Can a French Bulldog live a normal life with hemivertebrae? Many French Bulldogs with hemivertebrae show no clinical signs and live normal lives. However, if the malformed vertebra compresses the spinal cord, neurological signs can develop, and these require veterinary attention [1]. ### 4. How can I prevent skin fold infections in my French Bulldog? Regular cleaning of the skin folds with a vet-approved wipe or cleanser is the most effective preventive measure. Keeping the folds dry and addressing underlying allergies are also important [2]. ### 5. Why does my French Bulldog snore so much? Snoring (stertor) is a common sign of BOAS, caused by the elongated soft palate and narrowed nostrils. While it may seem normal for the breed, it is a sign of respiratory compromise and should be assessed by a veterinarian [4]. ### 6. Are French Bulldogs more unhealthy than other breeds? Yes, survey data indicate that 56% of French Bulldog owners believe the breed is less healthy than other breeds [1]. The breed is predisposed to respiratory, dermatological, and orthopaedic problems [2][3]. ### 7. What should I do if my French Bulldog collapses after exercise? Collapse after exercise is a red flag for severe BOAS and is a medical emergency. Seek immediate veterinary care, as your dog may require oxygen therapy and surgical intervention [4]. ### 8. Should I buy a French Bulldog given their health problems? This is a personal decision, but you should be fully informed of the breed's health issues before committing. Be prepared for potential veterinary costs and choose a breeder who prioritises health testing, including BOAS grading, over extreme conformation [1][6]. --- ## Sources [1] [Perception of dog health and attitudes towards BOAS grading among Danish owners of French bulldog.](https://pubmed.ncbi.nlm.nih.gov/41030677/) [2] [Health status and disease prevalences in French bulldogs in Germany: insights from a survey-based study.](https://pubmed.ncbi.nlm.nih.gov/42135868/) [3] [Demography and disorders of the French Bulldog population under primary veterinary care in the UK in 2013.](https://pubmed.ncbi.nlm.nih.gov/29750111/) [4] [Characterisation of Brachycephalic Obstructive Airway Syndrome in French Bulldogs Using Whole-Body Barometric Plethysmography.](https://pubmed.ncbi.nlm.nih.gov/26079684/) [5] [Great expectations, inconvenient truths, and the paradoxes of the dog-owner relationship for owners of brachycephalic dogs.](https://pubmed.ncbi.nlm.nih.gov/31323057/) [6] [Come for the looks, stay for the personality? A mixed methods investigation of reacquisition and owner recommendation of Bulldogs, French Bulldogs and Pugs.](https://pubmed.ncbi.nlm.nih.gov/32845902/) [7] [Why do people buy dogs with potential welfare problems related to extreme conformation and inherited disease? A representative study of Danish owners of four small dog breeds.](https://pubmed.ncbi.nlm.nih.gov/28234931/) [8] [Effects of Cocoa Genotypes on Coat Color, Platelets and Coagulation Parameters in French Bulldogs.](https://pubmed.ncbi.nlm.nih.gov/34356108/) ## Related Clinical & Scientific Guides * [Birman Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/birman-health-problems-inherited-conditions-and-cardiac-screenings) * [Singapura Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/singapura-cat-health-problems-inherited-conditions-and-cardiac-screenings) * [Siberian Cat Health Problems: Inherited Conditions and Cardiac Screenings](/knowledge/veterinary-medicine/breed-specific-health/siberian-cat-health-problems-inherited-conditions-and-cardiac-screenings)