American Bulldogs are a generally robust breed, but they carry specific genetic health risks that every buyer and breeder should understand. The good news is that most of the serious genetic conditions affecting American Bulldogs can be screened for through DNA testing before breeding decisions are made. Knowing what to look for -- and asking the right questions -- is the most powerful tool a buyer has for bringing home a healthy dog.
This guide covers the most significant health conditions seen in American Bulldogs: the genetic diseases that responsible breeders test for, the orthopedic conditions that affect many large breeds, the eye and skin issues common in the breed, and the acute conditions every owner should know about. It also explains what health testing looks like in practice and why the pedigree behind your dog matters as much as the individual puppy in front of you.
Genetic Diseases Specific to American Bulldogs
Two genetic diseases are specific to the American Bulldog breed and represent the most serious health concerns for anyone involved with the breed.
Neuronal Ceroid Lipofuscinosis (NCL)
NCL is a progressive and fatal neurological disease caused by a recessive gene mutation first identified in American Bulldogs. It causes the abnormal accumulation of lipopigments in the cells of the brain and nervous system, progressively destroying neurological function.
Affected dogs typically appear normal until symptoms begin, usually between 18 months and 3 years of age. Early signs can include:
- Loss of coordination and balance (ataxia)
- Behavior changes -- anxiety, confusion, altered personality
- Vision problems, often leading to blindness
- Seizures
- Tremors
- Cognitive decline
There is no treatment and no cure. The disease progresses until the dog's quality of life requires euthanasia, typically by age 3 to 5. It is heartbreaking for families and preventable through responsible breeding.
NCL follows a simple recessive inheritance pattern:
- Clear (N/N): Two normal copies of the gene. Cannot be affected and cannot produce affected offspring.
- Carrier (N/NCL): One normal copy, one mutated copy. The dog appears completely healthy but can pass the mutation to offspring.
- Affected (NCL/NCL): Two copies of the mutation. Will develop the disease.
Breeding a carrier to a carrier produces statistically 25% affected puppies, 50% carriers, and 25% clear. DNA testing through laboratories such as the University of Missouri identifies a dog's status with a simple cheek swab. A responsible breeder will never breed two carriers together. Carrier-to-clear breedings are acceptable as they cannot produce affected offspring, though the resulting carriers should continue to be tested before breeding.
Ichthyosis (ICH)
Ichthyosis is a hereditary skin disorder caused by a different recessive gene mutation, also specific to American Bulldogs. The condition affects the normal shedding of skin cells, causing abnormal scaling and thickening of the skin -- particularly on the belly, legs, and muzzle.
Affected dogs have skin that appears dirty or scaly regardless of bathing, flaking that can be dramatic in severe cases, and a coat that never quite looks right. The condition ranges from mild and cosmetic to significant and uncomfortable. There is no cure, but management with medicated shampoos and moisturizing treatments can help affected dogs be more comfortable.
ICH does not affect lifespan, but it is a lifelong condition that requires management and can affect quality of life. The inheritance pattern is the same as NCL -- simple recessive, with Clear, Carrier, and Affected classifications. DNA testing through the same laboratories that test for NCL can identify a dog's ICH status. Responsible breeders test for both conditions before breeding.
Orthopedic Conditions
Like many large, muscular breeds, American Bulldogs are prone to certain orthopedic conditions. These are not always preventable, but health testing of breeding stock and responsible breeding decisions significantly reduce the risk of producing affected offspring.
Hip Dysplasia
Hip dysplasia is a developmental condition in which the hip joint does not form properly, leading to abnormal contact between the ball and socket of the joint. Over time this causes cartilage wear, inflammation, and eventually arthritis. The condition ranges from mild -- manageable with weight control and appropriate exercise -- to severe, sometimes requiring surgical intervention.
Contributing factors include:
- Genetics -- the single most significant factor; heritability is well established
- Rapid early growth from overfeeding
- High-impact exercise on hard surfaces during the growth period
- Excess body weight at any age
OFA (Orthopedic Foundation for Animals) hip evaluations rate hips as Excellent, Good, Fair, Borderline, Mild, Moderate, or Severe. Responsible breeders have both breeding dogs evaluated by OFA and only breed dogs with passing grades (Excellent, Good, or Fair). Preliminary evaluations can be done at 12 months, but official certification requires evaluation at 24 months when hip development is complete.
Elbow Dysplasia
Elbow dysplasia is a similar developmental condition affecting the elbow joint and can cause significant front-end lameness. Like hip dysplasia, it has a genetic component and OFA elbow evaluations are available for screening breeding stock. Signs include front leg lameness, reluctance to bear weight, and pain on extension or flexion of the elbow.
ACL Tears (Cranial Cruciate Ligament Rupture)
ACL tears -- technically cranial cruciate ligament (CCL) ruptures in dogs -- are unfortunately common in American Bulldogs. The condition involves complete or partial tearing of one of the stabilizing ligaments in the stifle (knee) joint. It often presents as sudden rear leg lameness, the dog carrying one hind leg, or reluctance to bear weight on a hind limb.
Contributing factors include body weight (heavier dogs have higher incidence), conformation (steep rear angulation increases stress on the joint), and prior partial tears. Surgical repair is typically recommended for active dogs, as the joint deteriorates quickly without treatment and the other leg is often affected within a year or two due to compensatory stress. Weight management and appropriate exercise conditioning reduce, but do not eliminate, the risk.
Eye Conditions
Cherry Eye
Cherry eye is one of the most commonly seen eye conditions in American Bulldogs. It occurs when the third eyelid gland -- a tear-producing gland attached to the inner corner of the eye -- prolapses out of its normal position, appearing as a red, rounded mass in the corner of the eye. It looks alarming but is not immediately dangerous.
Left untreated, the exposed gland can become inflamed, infected, and progressively damaged, eventually affecting tear production. Surgical correction -- which repositions the gland rather than removes it, preserving its tear-producing function -- is the standard treatment. Some dogs experience recurrence and require additional surgical attention. Cherry eye can occur in one or both eyes.
Entropion
Entropion is a condition in which the eyelid rolls inward, causing the lashes and lid skin to rub against the surface of the eye. This causes irritation, tearing, discharge, squinting, and if untreated, corneal scarring and potential vision damage. It is corrected surgically. American Bulldogs with heavy facial wrinkling or loose facial skin are more prone to this condition.
Skin Conditions and Allergies
Skin issues are among the most common health complaints in American Bulldogs, particularly in the United States where environmental allergens are significant. ABs are prone to both environmental allergies (atopy) and food allergies, and the two can be difficult to distinguish without systematic elimination and testing.
Signs of skin allergies in ABs include:
- Chronic itching, particularly of paws, belly, armpits, and ears
- Recurrent ear infections
- Skin that is red, inflamed, or has a chronic "hot spot" pattern
- Paw licking that stains the fur between the toes rust-red from saliva
- Facial fold dermatitis in dogs with heavy wrinkling
Management typically involves identifying and avoiding triggers where possible, regular bathing with appropriate shampoos, and in more severe cases, veterinary-prescribed medications. Facial folds -- the skin wrinkles on a bulldog's face -- require regular cleaning to prevent moisture-associated skin infections. This is routine maintenance that every AB owner should incorporate into their grooming schedule.
Hypothyroidism
Hypothyroidism -- underactive thyroid function -- occurs in American Bulldogs at higher rates than in some other breeds. The thyroid gland plays a critical role in metabolism, and a dog with hypothyroidism will often show weight gain despite normal food intake, lethargy, cold intolerance, skin and coat changes (dull, thin coat; slow hair regrowth), and sometimes behavioral changes including apparent depression.
Diagnosis is through blood testing of thyroid hormone levels. Treatment with daily oral thyroid hormone replacement is straightforward, highly effective, and lifelong. A dog with well-managed hypothyroidism can have a completely normal quality of life. The condition is not heritable in the same direct way as NCL or ICH, but thyroid health is included in the health screening some responsible breeders perform on their dogs.
Bloat and Gastric Dilatation-Volvulus (GDV)
Bloat is a life-threatening emergency condition in which the stomach fills with gas and then twists on its axis, cutting off blood supply to itself and surrounding organs. It can kill a dog within hours without emergency veterinary intervention. American Bulldogs, as a deep-chested breed, are at elevated risk.
Warning signs of bloat include:
- Visibly distended or swollen abdomen
- Unproductive retching or gagging -- the dog is trying to vomit but cannot
- Restlessness, pacing, inability to settle
- Excessive drooling
- Rapid, labored breathing
- Pale gums
- Sudden collapse
If you see these signs, go to an emergency veterinarian immediately. Do not wait. Do not call to ask if you should come. GDV does not resolve on its own, and every minute matters.
Preventive measures include feeding from a raised bowl, avoiding exercise for at least an hour after eating, feeding two smaller meals per day rather than one large one, and avoiding food or water intake immediately after vigorous exercise. A prophylactic gastropexy (surgical tacking of the stomach to prevent rotation) can be performed during spay or neuter surgery and is worth discussing with your veterinarian if your dog has a particularly deep chest or a family history of GDV.
Why Health Testing Matters
The single most effective thing you can do to reduce your American Bulldog's health risks is to buy from a breeder who health-tests. This does not guarantee a healthy dog -- no test eliminates all risk -- but it dramatically reduces the likelihood of the most serious genetic conditions and tells you that the breeder is a responsible steward of the breed.
Minimum health testing for American Bulldog breeding stock should include:
- DNA test for NCL (Neuronal Ceroid Lipofuscinosis) -- both parents should be tested, and at minimum one should be Clear
- DNA test for ICH (Ichthyosis) -- same standard applies
- OFA hip evaluation -- at minimum a Fair rating on both parents
- OFA elbow evaluation -- normal on both parents
Some breeders also include thyroid panel testing, eye certification (CAER exam), and cardiac evaluation. The more complete the health testing, the more confidence you have in the breeding program.
When you look up a dog in the ABRA pedigree archive, health testing results on file are visible on the dog's profile. You can research the parents and grandparents of any litter you are considering and review their documented health history. This is the kind of transparency that responsible breeders support -- and that buyers deserve. For a deeper look at what testing exists and how to evaluate it, see our full health testing guide.