LEMP In Rottweilers Explained: What Breeders And Puppy Buyers Need To Know

Leukoencephalomyelopathy (LEMP) is a devastating neurological disease that we are seeing more frequently in Rottweilers — particularly as carriers become more common in the gene pool. Because this condition is inherited and currently untreatable, education and genetic testing are critical to protecting our breed.

If you are breeding, planning a litter, or purchasing a puppy, this is something you cannot ignore.

What is LEMP?

LEMP (Leukoencephalomyelopathy) is a severe, hereditary neurodegenerative disease that affects the white matter of the central nervous system — specifically the spinal cord and brain.

Affected dogs typically begin showing symptoms between 1 and 3 years of age. The disease progresses rapidly and is painless, but it ultimately leads to complete loss of mobility.

There is no cure.

Clinical signs and progression

LEMP is characterized by progressive ataxia (loss of coordination).

Early signs often include:

• Dragging of the paws

• Knuckling over at the pastern

• Stiff or uncoordinated gait

• Weakness that often begins in the front limbs

As the disease advances:

• Weakness becomes generalized

• Coordination continues to deteriorate

• Dogs may become completely immobile within 6–12 months

Because the disease is progressive and irreversible, euthanasia is often elected once quality of life declines significantly.

Cause and inheritance

LEMP is caused by a mutation in the NAPEPLD gene.

It is inherited in an autosomal recessive manner. This means:

• A dog with two copies of the mutation (LEMP/LEMP) will be affected.

• A dog with one copy (N/LEMP) is a carrier.

• A dog with two normal copies (N/N) is clear.

Two carriers bred together can produce affected puppies. That is why responsible genetic screening is essential.

Diagnosis

Definitive diagnosis typically involves MRI imaging, which shows:

• Symmetrical, non-contrast-enhancing lesions

• White matter damage in the cervical spinal cord and brain

However, by the time clinical signs appear, the disease process is already well underway.

Prevention through genetic testing is far more effective than attempting diagnosis after symptoms begin.

Is there treatment?

There is no effective treatment for LEMP.

Supportive care may temporarily help with mobility and comfort, but the condition is progressive and fatal. Prevention through informed breeding decisions is currently the only reliable strategy.

Genetic testing: the most important step

A DNA test is available to identify:

• Clear dogs (N/N)

• Carriers (N/LEMP)

• Affected dogs (LEMP/LEMP)

Breeders should utilize the official Rottweiler genetic panel from UC Davis Veterinary Genetics Laboratory, which includes LEMP testing:

👉 https://vgl.ucdavis.edu/panel/rottweiler

At minimum, at least one parent of every litter must be tested CLEAR (N/N) to ensure no affected puppies are produced.

Breeding a carrier to a clear dog will not produce affected puppies, but breeding two carriers together absolutely can.

What puppy buyers should ask

If you are purchasing a Rottweiler puppy, ask:

• Have the sire and dam been tested for LEMP?

• Can I see the official genetic results?

• Is at least one parent CLEAR?

A responsible breeder will provide documentation without hesitation.

Why this matters now

We are seeing more carriers identified in the breed. That does not mean panic. It means awareness.

Genetic knowledge gives us the power to make informed decisions. Ignoring it risks producing affected puppies and devastating families.

The tools are available. The test is accessible. The responsibility belongs to all of us.

If we want strong, healthy Rottweilers for future generations, LEMP testing must become standard practice.