Labrador Retriever Health and Diseases

Contrary to what it may seem, the Labrador Retriever is one of the healthiest, most athletic, and robust breeds. All the diseases mentioned below are also found in many other breeds, but perhaps the success in breeding Labradors in Great Britain and the United States — where it is one of the most popular breeds — has given us a better understanding of these possible pathologies. This does not mean they are more prevalent in this breed, but rather that we are more familiar with them.

The average lifespan of the Labrador Retriever is between 10 and 14 years, and with proper care, many specimens exceed this life expectancy. Prevention, early diagnosis, and responsible breeding are the best tools to ensure the health of our dogs.

Hip Dysplasia

Hip dysplasia is the best-known hereditary disease among breeders and veterinarians, affecting many medium to large-sized breeds. Affected animals show abnormal development of the hip joint, leading to premature wear of the articular cartilage, inflammation, and pain.

The etiology of the disease is polygenic multifactorial, meaning that multiple genes determine hip structure (genotype) and environmental factors such as nutrition, exercise, and habitat influence gene expression, resulting in a specific type of hip (phenotype). This complexity makes it difficult to create a reliable theoretical model of transmission.

At birth, all Labrador Retriever puppies have healthy hips. During the critical growth phase, from 3 to 8 months, the animal is predisposed to developing hip dysplasia according to its genetic code. Environmental factors, especially nutrition and exercise, play a crucial role during this period. It has been shown that obesity in puppies as young as 2 months negatively affects the onset of the disease.

Labrador Retrievers grow rapidly, reaching adult height in approximately one year. The high metabolic requirements during growth make adequate nutrition essential. Hypercaloric and hyperproteic diets that lead to overweight should be avoided. Moderate and controlled exercise also positively influences hip stability, as increased muscle mass stabilizes the joint and reduces subluxation.

The ideal scenario would involve genetic diagnosis, but it is currently unattainable. Therefore, a combination of radiological diagnosis (X-rays) and other essential data, such as progeny information, is used. Symptoms range from mild lameness to inability to walk. Affected dogs may exhibit characteristic movements, such as short steps, dorsal decompression (hip swaying), or “bunny hopping” when running.

Treatment options for hip dysplasia range from anti-inflammatory medications, specific diets, and alternative therapies (such as physiotherapy, hydrotherapy, and acupuncture) to surgical interventions. Triple pelvic osteotomy (TPO) is a highly effective procedure for young animals, while femoral head resection arthroplasty or total hip replacement are options for more advanced cases.

Elbow Dysplasia and Osteochondritis Dissecans (OCD)

Similar to hip dysplasia, elbow dysplasia has a genetic basis, manifesting as developmental anomalies of the joint in the puppy. Two distinct pathological entities are included within elbow dysplasia: ununited anconeal process and fragmented coronoid process. Both conditions stabilize around one year of age, with secondary osteoarthrosis processes appearing.

The genetic and environmental factors contributing to elbow dysplasia are similar to those of hip dysplasia. Breeding examinations, especially X-rays, are necessary for breeding specimens. Medical treatment involves exercise restriction, weight control, and anti-inflammatory therapy, while surgical interventions aim to remove detached cartilage or bone fragments to stabilize the joint.

Osteochondritis Dissecans (OCD)

Osteochondritis Dissecans (OCD) is a developmental disorder of articular cartilage that mainly affects large, fast-growing breeds such as the Labrador Retriever. It occurs when growing cartilage does not ossify correctly, causing a fragment of cartilage to detach and remain loose within the joint, causing pain, inflammation, and lameness.

The most commonly affected joints are the elbow, shoulder, and hock (tarsus). Symptoms usually appear between 4 and 8 months of age and include intermittent or persistent lameness, pain on movement, and stiffness after exercise.

Factors contributing to OCD include:

• Genetics: Hereditary predisposition is a key factor.
• Nutrition: Hypercaloric diets or calcium-phosphorus imbalance during growth.
• Excessive exercise: Repetitive impacts on immature joints.
• Rapid growth: Growth rate may exceed cartilage ossification capacity.

Diagnosis is made through X-rays and, in some cases, arthroscopy. Treatment can be conservative (rest, weight control, anti-inflammatories) or surgical (removal of the cartilage fragment through arthroscopy). Prognosis is good if detected early, although secondary osteoarthritis may develop in the long term.

Cranial Cruciate Ligament Rupture (CCL)

Cranial cruciate ligament (CCL) rupture does not have a direct genetic basis, but rather derives from the conformation and biomechanics of the breed. The knee joints of the Labrador Retriever, which rely on ligaments and cartilage for stability, are prone to excessive biomechanical loads during activities such as jumping, running, or sudden turns.

This injury is one of the most common causes of lameness in large breed dogs. Symptoms include sudden or progressive lameness, difficulty bearing weight on the affected leg, knee swelling, and pain on palpation. Diagnosis is made through joint X-rays and specific physical tests, such as the drawer test or tibial compression test.

Surgical repair is the most effective treatment, with several techniques available, most notably tibial plateau leveling osteotomy (TPLO) and tibial tuberosity advancement (TTA). Conservative management with strict rest and physiotherapy may be an option for smaller dogs or those with partial tears, although the risk of secondary osteoarthritis is higher.

Exercise-Induced Collapse (EIC)

Exercise-Induced Collapse (EIC) is a hereditary neuromuscular disease that occurs in the Labrador Retriever and closely related breeds. So far, the mutation has been identified in Labrador, Chesapeake Bay, and Curly-Coated Retrievers. Recently, the research group led by Professor James Mickelson from the University of Minnesota identified the responsible mutation in the DNM1 gene.

Initial symptoms of EIC include changes in the animal’s gait, limb stiffness, and unsteady walking. Affected animals show muscle weakness and collapse 5 to 15 minutes after intense exercise (for example, during hunting training or after significant stress). In most dogs, the hind limbs are particularly affected, and in some cases, forelimb weakness may also occur, leaving the animal lying down. During collapse, animals remain conscious, but in severe cases, they may become disoriented or even lose consciousness.

EIC can go unnoticed for years if the animal does not experience strong or prolonged stress. The responsible mutation is found in the DNM1 gene and can be detected through DNA testing. EIC inheritance is autosomal recessive, meaning a dog is only affected when it inherits a mutated gene from both the father and the mother.

The three possible genotypes are:

• Genotype N/N (healthy homozygous): The dog does not have the mutation and has a very low risk of EIC. It cannot transmit the mutation to its offspring.
• Genotype N/EIC (carrier): The dog has one copy of the mutated gene. It has a very low risk of EIC, but will transmit the mutation to its offspring with a 50% probability. This animal should only be bred with an EIC-free animal.
• Genotype EIC/EIC (affected): The animal has two copies of the mutated gene and has a very high risk of EIC. It will transmit the mutation to its offspring with 100% probability and should only be bred with an EIC-free animal.

More than 80% of dogs with EIC/EIC genotype show typical EIC symptoms by age 3 and have experienced at least one collapse. Dogs with N/EIC or N/N genotypes may also suffer similar symptoms, mainly caused by other reasons such as centronuclear myopathy (CNM), which causes muscle weakness and stiffness.

DNA testing allows direct detection of the responsible mutation. The analysis is independent of the animal’s age and can be performed in puppies. To maximize test reliability, each sample is independently analyzed twice.

Centronuclear Myopathy (CNM / HMLR)

Centronuclear Myopathy (CNM), also known as Hereditary Myopathy of Labrador Retrievers (HMLR), is an inherited muscle disease that specifically affects this breed. It is an autosomal recessive condition caused by a mutation in the PTPLA gene, which leads to progressive muscle weakness and atrophy.

Symptoms usually appear between 2 and 5 months of age and include:

• Generalized muscle weakness, especially in the hind limbs.
• Abnormal gait (“bunny hopping” or weakness when walking).
• Difficulty swallowing (dysphagia) and regurgitation of food.
• Exercise intolerance and rapid fatigue.
• Progressive muscle atrophy, especially in the head and neck.
• Altered voice (dysphonia) due to weakness of the laryngeal muscles.

The disease can vary in severity. Mild cases may allow a relatively normal life with special care, while severe cases can be disabling. Diagnosis is made through:

• DNA genetic testing to detect the mutation in the PTPLA gene.
• Muscle biopsy showing specific characteristics such as centralized nuclei in muscle fibers.
• Muscle enzyme analysis (CK, AST) which may be elevated.

Inheritance is autosomal recessive, similar to other genetic diseases of the breed. This means a dog needs two copies of the mutated gene (homozygous) to develop the disease. Carriers (with one copy) do not show symptoms but can pass the gene to their offspring.

Treatment is supportive and includes:

• Nutritional management: Feeding in an elevated position to facilitate swallowing and prevent aspiration.
• Physiotherapy to maintain muscle mass as long as possible.
• Avoiding excessive exercise and stress.
• Weight control to avoid overloading weakened muscles.

Genetic testing is essential for breeding programs, as it allows carriers to be identified and prevents crosses that could produce affected puppies.

Oculoskeletal Dysplasia Type 1 (OSD1)

Oculoskeletal Dysplasia Type 1 (OSD1), also known as osd1 or drd1, is a genetic collagen disorder affecting the Labrador Retriever. It is characterized by a combination of short-limbed dwarfism and vitreous dysplasia in the eyes, which can lead to retinal detachments and cataracts.

The disease is caused by a mutation in the COL9A3 gene, which is essential for collagen formation in cartilage and ocular tissues. The absence or deficiency of this collagen causes the characteristic malformations of the disease.

The first clinical signs can be observed from 4 to 6 weeks of age. Affected puppies present:

• Dwarfism: The legs, especially the front ones, are notably shorter in proportion to the rest of the body. The radius and ulna are short and tend to curve with growth.
• Ocular abnormalities: Include vitreous dysplasia, retinal detachments, and cataracts. They may also present with a domed skull and moderate strabismus.

Inheritance is autosomal recessive, meaning a dog must inherit two copies of the mutation (one from each parent) to develop the full form of the disease. Dogs with a single copy (carriers) do not have dwarfism but may show mild ocular alterations, such as focal retinal folds or retinal dysplasia plaques.

The frequency of this mutation in the general Labrador Retriever population is estimated at around 4%. DNA genetic tests are available to identify affected dogs and carriers, which is essential for responsible breeding. Breeding between two carriers should be avoided, as there is a 25% chance of producing affected puppies.

Hereditary Nasal and Plantar Hyperkeratosis (HNPK)

Hereditary Nasal and Plantar Hyperkeratosis (HNPK), formerly known as Hereditary Nasal Parakeratosis (HNP), is an autosomal recessive hereditary disorder in the Labrador Retriever. A T>G mutation in the SUV39H2 gene causes the nose and paw pads to become dry and thickened, resulting in chronic irritation and inflammation of the skin.

Symptoms of this disorder usually appear between 6 and 12 months of age. Affected dogs develop dry, rough noses with gray to brown crusts on the surface and edge of the nose. In some cases, painful cracks may form around and on the tip of the nose, which could lead to superficial bacterial infections if untreated. Over time, the nose often begins to depigment, changing skin color from dark to light. Similar lesions may also appear on the paw pads.

Although the disorder is not lethal, continuous care is required throughout the dog’s life to reduce the recurrence of excessive crust formation. Management includes topical application of moisturizing balms, and in some cases, essential fatty acid supplements (omega-3 and omega-6) may help improve skin condition.

The three possible genotypes are:

• HNPK/HNPK: The dog has two copies of the mutated gene and is homozygous for HNPK. This dog will be affected and will always pass the defective gene to its offspring.
• HNPK/N: The dog is a carrier of the SUV39H2 mutation and can pass a copy of the defective gene to its offspring in 50% of cases.
• N/N: The dog is negative for the SUV39H2 gene mutation and will not pass the defective gene to its offspring.

Tail Myopathy (“Limber Tail Syndrome” or “Swimmer’s Tail”)

Tail myopathy, also known as “limber tail,” “cold tail,” or “swimmer’s tail” (Limber Tail Syndrome), is a condition that, although not exclusive to Labrador Retrievers, occurs in them with some frequency. This anomaly consists of flaccid paralysis of the tail, and it draws attention because if there is one thing in constant motion in a Labrador, it is its tail.

The causes can be diverse:

• Intense exercise or prolonged hunting or training sessions.
• Baths in cold water or exposure to low temperatures.
• Baths before a show or competition.
• Inadequate resting areas (dogs confined in crates without being accustomed to them or for too long).
• Sudden changes in temperature or humidity.

It manifests as a lack of tail mobility, with inability to rise above the dorsal line, and pain upon palpation of the muscles at the base of the tail. Prognosis is always good; rest and anti-inflammatory treatment are usually sufficient for a complete recovery within a few days or weeks. It has only one problem: it usually appears on the day of a show, just before going into the ring, and unfortunately, it does not resolve in ten minutes.

Progressive Retinal Atrophy (PRA)

Progressive Retinal Atrophy (PRA), also known as Progressive Rod-Cone Degeneration (PRCD), is the most common hereditary condition in the canine retina. In this disease, there is an enzymatic failure in the retinal photoreceptors. If it first affects the rods, it will produce night vision loss; if it affects the cones, daytime vision loss will occur first.

The damaged retina will show pigmented areas, so it is classified as central PRA (if it affects the center of the retina) and generalized PRA (when pigmented areas are distributed everywhere). Central PRA is the one that generally affects the Labrador Retriever, is transmitted in a simple recessive manner, and usually manifests with a gradual and slow loss of vision beginning around three years of age.

Since fundus alterations usually do not cause pain, there are occasions when the owner is unaware of the disease until it is very advanced, hence the importance of routine examinations for early diagnosis. The first manifestations are usually a loss of central visual field, so the dog perfectly observes lateral movements but not central ones.

These are the dogs that come to their owner’s call zigzagging so as not to lose sight of them, or hunting animals that in the field are able to follow a downed bird to the ground but then are unable to locate it on the ground. If we find an affected animal, we will know that the parents are carriers of the gene and should not be used for breeding, and siblings have more than a 50% chance of also being carriers of the gene.

Genetic diagnosis through DNA testing (such as those offered by Optigen) allows animals to be classified into three groups:

• Optigen A (clear): The dog does not have the mutation and will not transmit the disease.
• Optigen B (carrier): The dog has one copy of the mutation. It will not develop the disease but can pass it to its offspring.
• Optigen C (affected): The dog has two copies of the mutation and will develop the disease. It will pass the mutation to all its offspring.

Genetic tests are valid for life and can be performed in puppies as young as 3 months of age. Their use in responsible breeding programs allows preventing the birth of affected puppies without completely eliminating carriers, which would help maintain the genetic diversity of the breed.

Other Ocular Abnormalities

In addition to Progressive Retinal Atrophy, there are other ocular alterations that can affect the Labrador Retriever. Many of them have a genetic basis or are a consequence of the breed’s conformation. Periodic ophthalmic examinations performed by specialists are essential to detect these abnormalities early and prevent their spread in breeding.

Microphthalmia

Reduced size of the eyeball, located in the lower part of the orbit. It may be accompanied by mucopurulent conjunctivitis and tearing. Its hereditary nature in the breed has not been demonstrated.

Entropion

Inversion of all or part of the eyelid margin, which may affect the upper, lower, or both eyelids. It is caused by alterations in the tension of the orbital muscles and is influenced by factors such as skull conformation, orbital size, and facial folds. It causes pain and irritation with continuous tearing due to the eyelid rubbing against the cornea. Surgical correction is simple and definitive. Its inheritance is polygenic.

Ectropion

Eversion of the lower eyelid margin that exposes more of the conjunctival surface of the eyeball, causing frequent conjunctivitis. Like entropion, surgical correction is definitive. Most cases of ectropion are due to an untreated or poorly healed injury to the eyelid margin.

Corneal Lipidosis

Lipid deposits in the cornea manifested as whitish spots on the front of the eye that allow some light to pass through. They are generally associated with high-fat diets or metabolic alterations.

Hereditary Cataracts

Opacity of the lens that affects the animal from birth and can cause total blindness. They can manifest from the moment the dog opens its eyes up to two years of age. They are transmitted by an autosomal dominant gene and their progression is variable.

Retinal Dysplasia

Congenital anomaly present at birth, where there is a lack of development of the retinal epithelium with disorganization of the outer layers, which can even cause retinal detachments. Affected animals are detected blind at 6-7 weeks of age, with dilated pupils that do not respond to light changes. It may be associated with microphthalmia.

Multifocal Retinal Dysplasia

Caused by abnormal retinal differentiation during the embryonic period and abnormal deposits of melanin pigment in various parts of the eye. It is still under study, so it has not yet been classified as a specific breed abnormality.