The Canine Ledger

DCM in Dobermans: Screening From Age Three

More than half of Dobermans in a European study developed heart muscle disease. Why yearly screening is recommended, from what age, and with which tests.

Written by thecanineledger

If your Doberman faints, collapses, is breathing fast or hard at rest, or suddenly tires on walks: see a vet now. These can be signs of a dangerous heart rhythm or heart failure.

A European study that followed 412 Dobermans with yearly heart checks found a “cumulative prevalence of Doberman Pinscher cardiomyopathy” of “58.2%” (Wess et al., Journal of Veterinary Internal Medicine 2010, abstract). Its conclusion was plain: “The prevalence of Doberman cardiomyopathy is very high in Europe.”

While a Doberman can look perfectly healthy for years, the disease often works silently, and sometimes the first sign is sudden death. This page explains what DCM is, why screening matters, and what the guidelines recommend.

1. What DCM is

Dilated cardiomyopathy (DCM) is a disease of the heart muscle. The muscle weakens, the heart enlarges, and it pumps less well. In Dobermans it can also cause dangerous rhythm problems.

It is inherited. The 2010 study says DCM in Dobermans “is an autosomal dominant inherited disease.” The 2017 screening guidelines from the European Society of Veterinary Cardiology (ESVC) say it “is inherited in Doberman Pinschers with a high prevalence (58%)” (Wess et al., Journal of Veterinary Cardiology 2017, abstract).

A long silent phase. Dogs can have the disease for a long time without signs. Vets call this occult or preclinical DCM.

Sudden death. The PROTECT trial reports that “Sudden death caused by ventricular tachyarrhythmia-fibrillation occurs before the onset of CHF in at least 25–30% of affected Dobermans” (Summerfield et al., Journal of Veterinary Internal Medicine 2012). CHF is congestive heart failure.

Our note: The sudden-death figure is the PROTECT authors’ background statement, not their own finding.

2. Why screening starts at three, not two

The 2010 study recommended “Yearly screening for DCM by Holter examination and echocardiography”, “starting at 2 years of age.”

The 2017 ESVC guidelines, written later by a task force, say “Screening for occult DCM in Dobermans should start at three years of age and use both Holter monitoring and echocardiography.”

This is why owners see both ages online. The newer guideline says three. Ask your vet or a cardiologist which they advise for your dog, especially if relatives were affected young.

Once isn’t enough. The guidelines say “Yearly screening over the life of the dog is recommended, as a one-time screening is not sufficient to rule out future development of DCM.”

Our note: We read only the abstracts. We don’t know why the 2017 task force changed its advice.

3. The two tests

Holter monitoring. Your dog wears a small recorder for 24 hours that counts irregular heartbeats. The guidelines say “Less than 50 single ventricular premature complexes (VPCs) in 24 h are considered to be normal in Dobermans, although detection of any number of VPCs is cause for concern.” VPCs are extra beats from the lower chambers of the heart.

Echocardiography. A heart scan measures the size and pumping of the left ventricle.

Why both. The disease can show up first in either test. The 2010 study found that males “showed earlier echocardiographic changes than did female dogs, which had significantly more VPCs.”

Cheaper extras. The guidelines describe blood tests for heart biomarkers and a 5-minute ECG. They “may have some utility when recommended tests are not available or financially untenable on an annual basis”, but they aren’t part of the standard protocol.

Our note: We print the “fewer than 50 VPCs is normal” line because you may see it on a Holter report. We leave out the other thresholds, so ask your vet what your dog’s report means.

4. Why early diagnosis matters

The PROTECT trial. 76 Dobermans with preclinical DCM were given a heart medication or a placebo. The median time to heart failure or sudden death was 718 days on the drug and 441 days on placebo. The authors concluded that the drug “prolongs the time to the onset of clinical signs and extends survival.”

Caveats. It was a small trial, and the proportion of dogs reaching the endpoint “was not significantly different between groups”. The trial’s conflict-of-interest declaration says it was funded by the drug’s manufacturer. The contract gave the investigators “the right to independently publish results of the study regardless of the trial outcome.”

What it means for you. Treatment can only start once the disease is found. Screening is what finds it.

→ Mitral Valve Disease in Cavaliers: Screening, and What the EPIC Trial Found · → Heart Failure at Home: Counting Your Dog’s Sleeping Breaths

5. For breeders and buyers

The ESVC guidelines are about screening individual dogs, not breeding. But because the disease is inherited, a puppy buyer may reasonably ask whether the parents have had Holter and echocardiography screening, how recently, and whether close relatives developed DCM.

→ Choosing a Breed or a Mix: The Health Data Breeders Don’t Lead With

6. What we could not verify

Commonly saidWhat we found
“Screen from age two”That was the 2010 recommendation. The 2017 ESVC guidelines say from age three.
“One clear scan means the dog is fine”No. The guidelines say a one-time screening is not enough.
“A scan alone is enough”No. The guidelines recommend both Holter monitoring and echocardiography.
“Only old Dobermans get DCM”Don’t wait for old age. The guidelines start screening at three and repeat it yearly for life.
“Diet causes DCM in Dobermans”Not according to these sources. They describe it as inherited. We haven’t covered diet-associated DCM in other breeds.

Sources

Always confirm with your vet before acting on anything on this page.