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DCM and the Doberman Crisis

Getting the the Heart of the Matter.
With all the good and grace that is the Doberman there is a dark shadow; Dilated Cardiomyopathy, DCM.
​DCM is a common form of heart disease among all dogs but particularly plagues the Doberman. Nearly 60% of all Doberman will be diagnosed with DCM by the age of 8 years old. There is no way to prevent DCM. It is a very complex disease. There are many factors to DCM, from environmental, hereditary, genetic, nutritional, eugenics, and more. It is a devastating disease, often fatal, and hard to detect early.
​https://onlinelibrary.wiley.com/doi/full/10.1111/j.1939-1676.2010.0479.x

The Rise of DCM

Before the 1970's DCM was barely heard of. Since the rise of the Doberman's popularity in the AKC show ring and in the hearts of people globally DCM has been on the rise. One theory, the "Popular Sire Syndrome", believes one or a few select dogs corrupted the once diverse gene pool and sacrificed the breeds health. The thought is one or a few very popular and in demand dogs dominated pedigrees eliminating much of the diversity that was once there. Another theory is inbreeding reduced the diversity. It is thought by selecting only certain traits or from certain popular kennel lines the breed foundation was sacrificed thus causing the decline of health and diversity. Many other theories exist but one thing is certain, the obvious lack of genetic diversity is the reason the Doberman suffers DCM like it does today.

Prevalence of DCM in Doberman Study: https://pubmed.ncbi.nlm.nih.gov/20202106/

Doberman and Genetics

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DCM was thought to have a genetic basis but the research is showing genetic mutations alone aren't the cause. The two most common genes researched are DCM1 (aka PDK4) and DCM2. The Doberman Diversity Project states 73% of unaffected Doberman tested in their research had one or both DCM genes and 99% of dogs diagnosed with DCM had one or both genes. Putting it in other words; 7/10 Doberman without clinical DCM carry a DCM gene. 99/100 Doberman who were clinically diagnosed with DCM had at least one DCM gene. Genes alone don't predict DCM. There have been many Doberman to develop DCM and not have the genes, as well as many to have a gene or both and not develop DCM. There is no proven known way to prevent DCM. It is a very complex disease with many factors from environmental, hereditary, genetic, nutritional, to eugenics, and even more. It is a devastating disease and so widespread in the breed there may not be a way to reverse it without drastic measures.
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DCM Myths

  • DCM can be bred out. - Sadly, no. Research fails to provide evidence that selective breeding practices of "DCM free" dogs lessens the rate of DCM affected dogs.
  • There are DCM free lines. - No, absolutely not! All Doberman are subject to develop DCM. Some lines seem more affected than others and some less, but no line is free from DCM.
  • European Dobermann don't get DCM. - False! FALSE! The original DCM study used European Dobermann. All Doberman come from the same ancestry, the same roots, the same foundation dogs, and thus have the same risk. http://dobermanpuppyforsale.com/health.html
  • Holter testing/Echos prevent DCM. - I wish they did. Unfortunately, many dogs who tested clear/normal have died later on of DCM.
  • Grain free foods cause DCM. - Maybe. There is a lot of strong evidence suggesting a link between grain free diets and nutritional DCM. Where that line falls in dobes, between nutritional and hereditary, is extremely blurred. It is best to er on the side of caution and feed a well rounded, inclusive diet.
  • Raw feeding like BARF prevent DCM. - Nope. Many raw fed dogs still go on to develop DCM. The only diet  scientifically linked to DCM is grain free. Often raw feeding leads to nutritional deficiency. Raw feeding in some cases may help reduce the rate of kidney disease as dry kibble tends to be really hard on a dog's urological system. A raw fed dog should be strictly monitored by their vet.
  • Supplements will prevent or cure DCM. - How I wish it was a simple as that. Human models show some promise in supplementation with l-arginine as a management aid as well as a way to prevent and reverse DCM but no such studies exist in Doberman or other dog breeds. Supplements should never be a replacement for medication or vet care.
  • DCM is always fatal. - Not always, just usually. Predictably usually. DCM can be managed and sometimes reversed with early intervention and extensive treatment. Nutritional DCM can be reversed in most early and mild cases. The type/method of DCM in Doberman tends to be a silent and sudden killer making treating it difficult.
  • Stem Cell Therapy can cure DCM. No, it can't cure DCM but may be a good treatment. Stem Cell Therapy is still a new industry and needs more study and time to show if it is an effective treatment. It shows promise, but is extremely expensive and not easily accessible. For now, it just is not a practical option for managing DCM positive dogs.

Doberman Diversity Crisis, Diet, and DCM as an Autoimmune Disease

DCM Autoimmune Disease Study
There is a strong link between DCM and diet in several breeds. Vets noticed a sharp increase in DCM cases in breeds not typically prone to DCM. Many pet owners went to the FDA and complained about thier pet's health, which promptly the FDA to look into the matter. While research into the exact cause is still in process one thing is certain; fad diets are bad for our dogs. Fad diets include grain-free, exotic meats, meat only diets, BARF, raw diets and vegan (please, don't feed your omnivorous pet a plant only diet; it will kill him). Avoid trending diets and cures (such as tea tree oil, coconut oil, garlic - which is TOXIC to dogs, and so on). The evidence is solid; fad diets are hurting our pets. But what else may be? Many external factor have an effect on the disease. DCM is complex and hard to predict.
Doberman are one of the most inbred of all the dog world. All Doberman share the same 10 halotypes. That means they are all so closely related to one another it is as if breeding family members together! The average inbreeding ratio is 43%! There is not much diversity left to support healthy dogs and sustain a stable population for long. Lack of diversity gives rise to genetic mutations being passed down more frequently. Smaller gene pool the more the traits are shared. DCM isn't just genetic related, there is a diet component too.
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https://plearl.wordpress.com/2019/05/08/pdk4-and-canine-dcm/
Doberman Genetic Crisis - https://www.instituteofcaninebiology.org/blog/an-update-on-the-genetic-status-of-the-doberman-pinscher
​https://www.instituteofcaninebiology.org/blog/are-we-watching-the-extinction-of-a-breed-or-why-are-we-focused-on-consequence-instead-of-cause
​Doberman Longevivity Study - https://www.veterinarypracticenews.com/uf-announces-lifetime-study-on-fatal-heart-disease-in-doberman-pinschers/
Doberman Diversity Project (open to select populations) - https://www.dobermandiversityproject.org/
Grain Free Diet/Nutritional DCM - https://news.vin.com/vinnews.aspx?articleId=52712
​https://www.vin.com/apputil/content/defaultadv1.aspx?meta=&pId=11149&id=3846592
Rates of DCM - https://www.ufaw.org.uk/dogs/doberman-pinscher-dilated-cardiomyopathy
Predictors of DCM - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4913570/
DCM Related Autoantibodies - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0214263

Why What was Recommended isn't Working

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"Clearly, the efforts made by breeders over the last three decades to decrease the incidence DCM have had no effect at all on the prevalence of the disorder. Not even a little." - Carol Beuchat PhD
The above chart on the left shows a striking and steady increase in DCM in the Doberman breed. The chart above on the right shows a sharp decline in the breeds life expectancy. Efforts to reduce DCM have been ineffective. Efforts such as the Holter Project failed to reduce DCM rates by avoiding DCM families and DCM positive dogs. There is clear evidence that DCM is on the rise and longevity is in decline.
Echos, asculations and holter monitoring are excellentdiagnostic tools but have limitations. They are only a SNAPSHOT into the cardiac function at that time and for that duration. They are not a guarantee against developing the disease. 

"Recommended Testing Protocol for Cardiac Disease. Annual echocardiograms (an ultrasound of the heart), together with 24 hour Holter Monitoring, provides a snapshot of a dog's current heart health at that moment in time. Your vet can also perform a simple blood test that measures the concentration of NTproBNP in your dog's blood and is a good indicator of heart health. It is important to understand that test results can be normal one year and a dog can show signs of DCM the very next year. This is why breeders must perform ANNUAL heart screening. Two DNA genetic tests are available; they identify two mutations (PDK4) and DCM2) that are thought to be associated with DCM. The tests involves a simple cheek swab and don't necessitate a veterinary visit."
https://www.dobermandiversityproject.org/diseases.html

DCM Genes are IMPORTANT

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"Important note about the TTN mutation (also known as DCM2): The vast majority of research exploring the genetics of DCM has been performed on purebred American Dobermans, a high risk population for DCM. Even in the Doberman, DCM2 is incompletely penetrant, meaning that while having one or two copies of this mutation is thought to confer some increased risk of developing DCM, it is by no means predictive of disease. DCM is a highly complex disease that is modulated by many genetic factors, most unknown. In addition, Embark and others have identified this mutation in multiple breeds, including breeds where DCM is not a common disease. The impact of this mutation in these breeds is unknown: Embark hopes to change this." - Embark on TTN/DCM2
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Prevalence of DCM
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Autoimmune DCM
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Another tidbit to note; PDK4 (aka DCM1) is not associated with DCM in the European population. It is important to know the pedigree; if there are any non-Euro dogs in the pedigree PDK4 may be associated with DCM in your dog! There are other DCM variants that do have significance in risk of disease development.
https://www.google.com/search?q=pdk4+doberman+european&oq=PDK4&aqs=chrome.1.69i57j69i59j69i61.7369j0j9&sourceid=chrome&ie=UTF-8
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PDK4 was associated with autoimmune-like cardiac disease DCM in American Doberman, information on dogs was provided by the DCPA. "​The results from our PDK4 gene replacement studies showed improved cellular viability and reduced mitochondrial toxicity, ROS generation, and caspase-9 activation in response to starvation in AAV-PDK4-treated fibroblasts that were deficient for PDK4. In addition to confirming the cause-effect relationship between deficient PDK4 function and mitochondrial-mediated apoptosis, these data also provide strong support for the translation of this gene therapy approach into PDK4del/del DPs in the clinic. ... In sum, we have demonstrated the importance of PDK4 function during periods of low nutrient availability. Our observed activation of the intrinsic apoptotic pathway in fibroblasts deficient for PDK4 suggests that cardiomyocytes in the hearts of PDK4wt/del and PDK4del/del DPs face a similar metabolic challenge. While these dogs rarely experience true nutrient deprivation, the inability to effectively switch from glycolysis to oxidative phosphorylation likely has minor initial consequences that evolve over time into cardiac remodeling and ultimately result in DCM and heart failure. Further investigations into the specific diets of affected and unaffected DPs with identical mutation statuses may reveal a relationship between the development of DCM and nutrition in this at-risk population." - ​​https://www.liebertpub.com/doi/full/10.1089/biores.2017.0023
There is a possible link to nutrition and the PDK4 gene mutations. A proper, balanced diet is important in maintaining optimal cardiac health. It is best to follow proven diets, such as those routinely screened by canine nutritionists and to avoid fad diets (such as raw/BARF/BARD and homemade feeds). ​"Mitochondrial function was altered in skin fibroblasts of Doberman Pinschers with DCM and PDK4 mutation." Gene therapy was insignificant in treatment of the dogs affected with DCM and PDK4 mutation.
- https://pubmed.ncbi.nlm.nih.gov/27027709/, additional articles: https://avmajournals.avma.org/doi/10.2460/ajvr.77.2.156, 
​
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5745584/
A study of the German Doberman populations found "significant genome-wide associations" on the CFA 5 (A lotus) to clinical DCM. "The association could be confirmed in an independent cohort of Doberman Pinschers from the UK. ...  In conclusion, we have mapped a major genetic risk factor for DCM in the Doberman Pinscher to CFA 5. In the region of the association signal, no obvious DCM candidate genes are located. Thus the further investigation of this association signal has a high chance of identifying a new DCM gene that might also be of relevance for a fraction of the unexplained human DCM cases." - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0020042 

The science behind DCM genetics is solid and proven. It is real, tangible and reliable. There is validity to the genes significance in indirect disease predisposition. Though the genes are a small portion of DCM risk they are still very important! Any piece of the puzzle is a crucial one. It is important to note that, while the DCM genes play a role in the indirect predisposition to the disease, they are not diagnostic nor preventative. In December 2011 the Doberman tested  through Vetnostic as clear/two normal DCM1(PDK4) genes 15% had early clinical symptoms of DCM. DCM is complex and has many factors. The genes are an important step in mapping out the cause of DCM but shouldn't be used as definitive testing.

Other Factors into Developing DCM

DCM can be caused by a variety of other factors;

Methods to Reduce DCM Ocurrence

  • Elimination Method - Stop breeding dogs with DCM genes or who have positive echos/holter tests.
  • Avoidance Method - Avoid lines and familial groups who develop or are related to a dog that develops DCM.
  • Selective Breeding - Breed only certain dogs who meet a strict genetic and physical standard.
  • Outcross Genepools - Staying within the breed, bring in unrelated lines and breed together
  • Outcross Other Breeds - Select one or multiple breeds to crossbreed into the Doberman and selectively breed the desirable dogs back to purebred Doberman, continuing to breed back to more purebred Doberman.
  • Low COI Method - Selectively breed dogs with testes low COI (Coefficient of Inbreeding) to produce low COI litters

Outcrossing? Is it a Viable Option?

I am not shy about supporting outcrossing. I believe outcrossing done right, to breeds not prone to the same cardiac, eye, and cancers that plague Doberman, would benefit the breed. One risk of outcrossing with other breeds is it could potentially lose what the Doberman is. I believe crossing back to the breeds that helped establish the Doberman will help reduce any lost traits (if any), making it easier to cross back into the Doberman we all know and cherish.
​
Much like the LUA program that outcrossed to correct and reduce the rate of painful and often fatal bladder stones in the Dalmatian, an outcross program may help save the Doberman breed and allow for fresh, untapped lines to be worked into the diversity pool. Diversity can't be added without actually adding to the gene pool. You can't just create new diversity from the diversity we have now.

Let's speculate an outcross program is started and approved by the DPCA. How should it be done? I personally feel we should avoid breeds with VWD, PRA, and cardiac issues. Selecting the best dogs genetically as well as health-wise is crucial. Second, you would breed to look at the dog physically, matching with breeds similar in build to the Doberman. Thirdly, you want to consider the temperament and working ability. You don't just want a dog to look like a Doberman, you want it to be ​a Doberman. Once you have established a solid base of dogs to cross between, you then start the tedious process of selecting which dogs fit the Doberman standard and your health/program aim and keep them back. You continue to selectively breed until you have worked back up to purebred Doberman (genetically testing as 98% and higher). Temperament testing and working ability can be assessed by professional trainers.

I firmly believe the key to saving the Doberman and preserving the breed is to create more diversity. How that is to be best done is the million dollar question!

"As far as we are aware, there are currently no formal breeding schemes operating which aim to reduce or eliminate this common condition from the Doberman pinscher breed. A genetic test would be very valuable as this would enable the detection and removal of affected individuals from the breeding pool. However, because the condition is so common in Dobermans, there is concern that removal of all affected individuals from the breeding pool might cause excessive restriction in the choice of Dobermans to breed from, and hence a reduction in the size of the breed’s gene pool with the risk that other genetic defects may inadvertently increase in frequency. Such problems could be avoided by out-breeding with dogs of other breeds." - ​https://www.ufaw.org.uk/dogs/doberman-pinscher-dilated-cardiomyopathy

Keeping Purebreds Purebred

Many fear a true outcross program would ruin the breed's integrity and "dilute" their purebred status. I want to see the breed preserved and thrive. I am passionate about maintaining the breeds integrity. Doberman are a unique and versatile breed. I feel there may be hope for the breed as long as pockets of lesser known or used lines are tapped into. Genetic diversity lies in unused pockets across the country and around the world. Maintaining the Doberman as we know it today is crucial to keeping the breed intact.  The key to keeping purebreds purebred is to find and use lesser known dogs. Pet lines and imports from smaller countries may offer invaluable genetic material. Those pedigrees are often snubbed by fanciers of champion dogs and champion pedigrees because they lack the thrill, name, and popularity found in show or working kennels. Working lines bred to show lines can help create diversity. Show lines bred to service lines, pet lines bred to working lines, American pedigrees bred to imports ... we still have some tangible room to work with!

What is the Best Way to Screen for DCM?

Ideally, screening using every method available would be the safest way to detect DCM. That is not the most economical or affordable option as most breeders are on a budget. Keep in mind a holter test alone can be over $400 annually. An echo is between $300-1200, depending on the state and clinic. Blood work is typically the cheapest option and will give some insight into cardiac health. Screening for DCM is diverse. There are many ways to detect DCM to fit all budgets. No test is really better than another; each test has value.
  1. The first testing option is blood markers: NT-pro BNP, Troponin 1, N-Terminal pro-B-type Natriuretic Peptide (cardiac panel). This method is often the most affordable one and easiest to access as any veterinarian can order it.
  2. The second (and very accurate) screening is a 24 hr holter. ​Holter testing is extremely reliable, and is the most affordable option if you purchase your own unit. Holter alone can be enough to diagnose DCM regardless of clinical symptoms.
  3. Another method of screening is chest xray: assess the size of the heart and any fluid in the chest/around the heart or lungs. "Radiology plays an important part in the diagnosis and management of cardiac disease. It allows assessment of the pulmonary vasculature and lungs which is not possible with echocardiology​" https://vetspecialists.co.uk/fact-sheets-post/dilated-cardiomyopathy-dcm-fact-sheet/, https://www.vetstream.com/treat/canis/freeform/radiology-cardiac-examination
  4. The next screening method is echo/auscultation. It is more expensive than a holter test but is reliable in detecting DCM and changes in heart size/function. "Results suggest that 12-lead A-ECG might improve diagnostic value of short-duration ECG in earlier detection of canine DCM as five selected ECG parameters can with reasonable accuracy identify occult DCM in Doberman Pinschers." https://ntrs.nasa.gov/citations/20110011044
  5. Another combo screening method is 24 holter and NT-pro BNP done annually.  "Combination of NT-proBNP and Holter to detect ODCM yielded sensitivity of 94.5%,specificity of 87.8%, and accuracy of 91.0%."  ​https://onlinelibrary.wiley.com/doi/full/10.1111/j.1939-1676.2012.1000.x
  6. The current most popular combo screening method is 24-hr holter and annual or bi-annual echo/auscultations. These methods take a look at the shape and function of the heart, but not of the vascular system (which an Xray does).
  7. The last combo screening method is a 5 minute echo/auscultation, a 24-hr holter, and NT-pro BNP done annually. The European Society of Veterinary Cardiology recommends "Screening for occult DCM in Dobermans should start at three years of age and use both Holter monitoring and echocardiography. ... The guidelines also provide recommendations concerning ancillary tests, that are not included in the standard screening protocol, but which may have some utility when recommended tests are not available or financially untenable on an annual basis. These tests include assay of cardiac biomarkers (Troponin I and N-Terminal pro-B-type Natriuretic Peptide) as well as a 5-min resting electrocardiogram (ECG)." 
Try to find a breed-knowledgeable vet, such as this animal hospital: https://raleighbartlettanimalhospital.com/2019/08/23/have-a-heart-holter/
​
Testing for DCM: ​https://www.vin.com/apputil/content/defaultadv1.aspx?id=3860877&pid=11242
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​https://alba-medical-systems-inc.square.site/product/canine-holter-package-dr200-/13?cs=true
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How We Manage Our Breeding Program and DCM

I  aim to breed from pedigrees with longevity. I seek out various lines and origins to keep as diverse as possible. I aim to produce low coefficient of inbreeding percentages and preserve diversity. I feel that we are limited in what pools are available in the Doberman world, but I still strive to bring the most diversity into my program that I can find. I focus primarily on genetic health. I breed for sound health more than aesthetics or flashy pedigrees. I feel the best direction is in taking a step backwards and focusing on the pools of Doberman that get overlooked so often just because they lack champions or prestigious names (pet lines, outside pedigrees, imports from lesser known countries, old lines, etc.). I work closely with many breeders who share a similar vision and passion for the breed, who want to see better dogs produced health and genetic wise.

The Real Question: Do I Holter/Echo?
​Holter: In 2020 I purchased our first holter (the DR200) unit to for use in my program. My holter is NOT for rent/lease.
Echo/Auscultation: I do annual-biannual echos and auscultations examining for congenital defects as well as changes in the heart.
I do annual holters.

Evidence suggests lack of genetic diversity may cause DCM to behave more as an autoimmune disease (β1-AAB associated autoimmunity). In Doberman the PDK4 gene has been shown to have metabolic change which remodels the heart, eventually leading to heart failure. Holter and echos are diagnostic tools used to identify DCM and cardiac abnormalities. It can not prevent DCM, just diagnose it. The last 30 years of holter and echo testing has failed to reduce the rate of DCM, even with the Holter project and DCM education. DCM effects over 50+% of the breed. With half of all Doberman developing DCM in their lifetime testing has failed to be a reliable method in eliminating DCM. Knowing is valuable, but it won't stop DCM. DCM is much more complex than originally believed. Again, I redirect back to the topic of diversity. I firmly believe lack of diversity has given way to the rise of DCM.
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What to Take From This

It may seem overwhelming but in short DCM has a strong hereditary component and there is no guarantee your Doberman won't develop the disease at some point in their lifetime (much like how heart disease runs in certain families in us humans). Hereditary DCM tends to be more frequent in populations with more inbreeding. DCM also has a solid genetic component that may indirectly disposition a dog to develop it. Having a DCM gene does not mean a dog will develop the disease; remember DCM is a complex disease with many components. DCM may also be caused by an insufficient diet, so feeding a balanced kibble or canine-nutritionist certified diet is important. Avoid fad diets like raw (BARF/BARD, whole prey, meat only, etc.) that are notorious for lacking adequate nutrients. Diet related DCM is called Nutritional DCM. Other factors that affect heart health are activity level/exercise and body composition (underweight and overweight dogs have additional heart stress and are more likely to develop heart disease). The best way to reduce the prevalence of DCM is to take all factors into consideration; lower the inbreeding percentage, reduce or eliminate DCM genes where possible, feed a balanced diet, and keep your dog fit and active. 

​When looking for a Doberman keep in mind NO line is free from the DCM risk. It is the shadow that haunts the breed. Maybe in time research will find a way to eliminate it. Right now, many scientists are leaning towards low COI as the key to reduce and potentially eliminate DCM one day. Good breeders look beyond the appearance and titles. They look past the health testing. Good breeders look at the future; they look at how to get today's dogs to be tomorrow's foundation. No line is DCM free. A good breeder should explain the breed's disposition to DCM and should be breeding for diversity and for longevity. Hopefully, as good breeders  breed for the future DCM will be just a vague memory. 

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