Understanding JLPP Certificates

JLPP is an inherited neurological disease resulting in certain death for any puppy affected with it. This disease cannot be cured or prevented once the puppy is conceived. Neither can this disease develop during the life cycle of a dog nor be the result of complications from other illnesses. All puppies affected by this disease die very young – most before they are one year of age.

The JLPP gene is a recessive gene. This means that a puppy must carry two JLPP genes in order to be affected. This requires both parents to be carriers of the gene and for them both to pass on the gene to the puppy. Statistically, from a litter where both parents are carriers of the JLPP gene there is a 25% chance that a puppy will be affected (always lethal), 50% chance that it will be a carrier and 25% chance that the puppy will be clear of the gene. It is important to note that only an affected puppy (one that carries two JLPP genes) will have any symptoms from this disease. Any puppies born carriers (ones that have a single JLPP gene) or clears (ones with no JLPP genes) will never suffer from this disease.

JLPP Status Explained:

Clear: This puppy/dog does not carry any JLPP genes. If bred to another clear then 100% of puppies produced will be clear of the JLPP gene. If bred to a carrier then there is a 50% chance that a puppy will be clear and a 50% chance that it will be a carrier.

Carrier: This puppy/dog carries one JLPP gene. This dog will live a normal life, with no ill effects associated with this gene. A carrier should only ever be bred to a clear. Breeding a carrier to a clear will produce puppies with a 50% chance of being clear and a 50% chance of being a carrier. If the carrier is bred to another carrier (which should never be done) then they will produce puppies with 25% chance of being affected (always lethal), 50% chance of being a carrier and 25% chance of being clear.

Affected: This puppy carries two JLPP genes. Sadly this puppy will die at a young age – in most cases before it is one year old. Symptoms start at 10 weeks and will continue for a number of months until death. This dog should never be bred with under any circumstances.

Acceptable Scores:

The NRC(A) requires that all breeding dogs must be tested for this gene. Both clear and carrier dogs may be bred with, but, affected dogs must never be bred from. If a dog is a carrier then it must only be bred to a clear. The ANKC does not require Rottweilers to be tested for this gene.

Acceptable pairings:

Clear x Clear

Clear x Carrier

Helpful Tips:

When buying a Rottweiler puppy it is highly recommended that at least one parent has been tested JLPP clear. Buying a puppy whose parents have not been tested or only one has been tested and their result is carrier may result in you buying a puppy that has been born JLPP affected and which will die before the age of one year old.