Heart disease is the second leading cause of death in dogs and a leading concern in older cats. The good news: it is one of the most diet-responsive conditions in veterinary medicine.
Two decades ago, dilated cardiomyopathy (DCM) was almost exclusively a genetic disease of large breeds — Dobermans, Boxers, Great Danes, Cocker Spaniels. Today, veterinary cardiologists are seeing DCM in breeds that historically never developed it: Golden Retrievers, mixed breeds, even small dogs.
The FDA opened a formal investigation in 2018. The pattern that emerged: many of these "non-genetic" DCM cases were dogs eating grain-free kibble heavy in legumes (peas, lentils, chickpeas, potato). When their diet was changed and taurine was supplemented, many dogs' heart function improved dramatically.
The mechanism remains debated. The leading theories:
• Taurine deficiency or impaired bioavailability — high-carbohydrate, legume-heavy diets may interfere with how dogs synthesize and use taurine, even when blood taurine appears normal
• Plant protein replacing animal protein — peas and lentils inflate protein percentages on labels but lack key amino acids
• Sulfur-containing amino acid imbalance — methionine and cysteine are precursors to taurine; deficiency cascades through the body
What is NOT debated: dogs and cats fed species-appropriate diets rich in fresh muscle meat and organs (especially heart!) — naturally rich in taurine — have dramatically lower rates of acquired DCM.
Dr. Karen Becker — the most-followed veterinarian in the world and NYT #1 bestselling author of The Forever Dog — has been clear and consistent on heart health for over a decade:
"Because taurine is so critical for cardiovascular health in both cats and dogs, and because we cannot guarantee adequate bioavailability from any processed diet, I recommend that all pets be supplemented with high-taurine foods or supplemental taurine — regardless of what they're currently eating." — consistent with Dr. Becker's documented teaching
Her core principles for heart health align with the L.I.F.E. framework:
• Lifestyle — moderate daily exercise (cardiovascular conditioning), maintain ideal body weight (overweight is the single biggest controllable heart risk)
• Ideal Microbiome — gut inflammation drives systemic inflammation, including in heart tissue
• Food — fresh muscle meat and organ meats provide bioavailable taurine, CoQ10, and L-carnitine naturally
• Environment — minimize toxin exposure (lawn chemicals, household cleaners) which create oxidative stress on heart cells
The following breeds have documented genetic predisposition to heart disease. If you have one of these breeds, prevention starts before any symptoms appear:
Dilated Cardiomyopathy (DCM):
• Doberman Pinscher (highest genetic risk)
• Boxer
• Great Dane, Irish Wolfhound, Saint Bernard
• Cocker Spaniel (American)
• Newfoundland
• Mixed-breed large dogs
• Recent FDA-investigated grain-free kibble cases across many breeds
Mitral Valve Disease (most common cause of heart failure in small dogs):
• Cavalier King Charles Spaniel (extreme genetic risk — 90%+ develop by age 10)
• Chihuahua, Toy/Miniature Poodle, Pomeranian
• Yorkshire Terrier, Maltese, Shih Tzu
• Dachshund
Hypertrophic Cardiomyopathy (most common cat heart disease):
• Maine Coon (genetic test available)
• Ragdoll
• British Shorthair, Persian, Sphynx
• Mixed-breed cats are also affected, just less frequently
Heart disease in pets is often silent until late stages. By the time symptoms appear, significant damage has occurred. Knowing these signs lets you catch it early:
⚠️ See your vet immediately if you notice:
• Coughing — especially at night or when lying down
• Exercise intolerance — tiring on walks they used to handle easily
• Increased respiratory rate at rest — over 30 breaths/minute when sleeping (count for 60 seconds)
• Fainting or collapse episodes — even brief
• Abdominal swelling / pot-belly appearance — fluid accumulation
• Pale or bluish gums — poor circulation
• Sudden hind-leg weakness in cats — sign of saddle thrombus, a cardiac emergency
Track resting respiratory rate at home: When your pet is sound asleep, count breaths for one full minute. Healthy: under 30/min. Over 35/min consistently warrants a vet exam. Over 50/min is an emergency.
For pets with diagnosed heart disease, this is a SUPPORT protocol — not a replacement for veterinary cardiology care. Coordinate with your vet, especially if your pet is on heart medications (pimobendan, ACE inhibitors, diuretics).
For preventative use in healthy at-risk breeds, this is a comprehensive protocol that aligns with the science.
Foundation 1: The Diet Switch
First and most important: get off legume-heavy grain-free kibble. If currently feeding ACANA, Orijen, GO!, Open Farm grain-free, or any kibble with peas, lentils, or chickpeas in the top 5 ingredients — this is the single biggest change you can make.
The destination is fresh raw food rich in muscle meat AND organ meat (especially heart, which is naturally the highest-taurine food on earth):
• Big Country Raw Beef Dinner with Heart — naturally taurine-dense, rotational variety
• Carnivora — formulations that include hearts and organs in correct ratios
• SMACK Dehydrated Raw (Winnipeg-made) — convenient format if no freezer space
• Big Country Raw Beef Hearts — can be fed as a topper 2–3×/week for additional taurine boost
Foundation 2: Carino Pets Omega 3 with DPA (Harp Seal Oil)
Marine omega-3s are arguably the most-studied supplement for cardiovascular health in both human and veterinary medicine. They reduce cardiac inflammation, support arterial flexibility, and lower triglycerides.
Carino Pets harp seal oil contains DPA (docosapentaenoic acid) — found in negligible amounts in fish oil but abundantly in seal oil. DPA is the only omega-3 that converts bidirectionally to both EPA and DHA, giving the body precisely what it needs. Multiple human cardiology studies have linked DPA specifically (separate from EPA/DHA) to reduced cardiovascular events. Product of Canada, available in 250 mL, 500 mL, and 1,000 mL sizes.
Daily, on every meal, for the rest of their life. This is the cornerstone heart supplement.
Foundation 3: Carnivora Earth Greens
Earth Greens delivers chlorella, spirulina, and kelp — providing naturally chelated minerals, antioxidants, and trace elements depleted from modern soil. Research consistently shows that pets (and humans) with adequate magnesium and potassium have healthier cardiac rhythms. Most processed pet foods are deficient.
Foundation 4: Mushroom Super Immune Blend
Reishi mushroom — one of the components in Head to Tail's Super Immune Blend — has been used in Traditional Chinese Medicine for cardiovascular support for over 2,000 years. Modern research has confirmed mechanisms: reduced platelet aggregation, lowered systemic inflammation, support for the autonomic nervous system that regulates heart rate.
For senior dogs of at-risk breeds, this is preventative gold.
If your pet has been diagnosed with heart disease, the protocol expands. Always discuss with your veterinarian or veterinary cardiologist — some integrative additions interact with cardiac medications.
Additional considerations for diagnosed cases:
• Taurine supplementation — for diagnosed DCM cases, additional taurine (500–1000mg twice daily for medium dogs, dosed by weight) is often recommended by integrative cardiologists. Discuss with your vet. Cats: taurine is a dietary essential and almost always supplemented.
• L-Carnitine — works synergistically with taurine in cardiac muscle; documented improvement in some DCM cases (especially Boxers and Cocker Spaniels)
• Coenzyme Q10 (Ubiquinol form) — supports mitochondrial energy production in cardiac cells; substantial human cardiology research
• Hawthorn Berry — traditional cardiac tonic; supports gentle heart rate regulation. Use under veterinary integrative guidance — interactions with some cardiac medications.
• Tri-Acta H.A. — for senior dogs with both joint and heart concerns, joint inflammation contributes to systemic inflammatory load. Reducing this load supports cardiac recovery.
Things to remove for heart disease cases:
• High-sodium treats — bully sticks, jerky, deli scraps. Read labels carefully.
• Processed kibble entirely if possible — even premium kibble carries inflammatory load that compromised hearts cannot handle well
• Excessive exercise during diagnosis period — heart disease patients need cardiac conditioning, but it must be calibrated. Work with your vet on a graduated activity plan.
Cats are in some ways more vulnerable than dogs to dietary heart disease. Taurine is an absolute dietary essential for cats — they cannot synthesize it from precursors at all (unlike dogs, who have limited synthesis capability).
Hypertrophic cardiomyopathy (HCM) is the most common heart disease in cats and is partially diet-responsive. Cats fed dry kibble exclusively are at higher risk for several reasons:
• Chronic dehydration from the moisture-poor format (10% vs prey's 70%)
• Lower bioavailable taurine in heat-processed proteins
• Carbohydrate load that cats are not metabolically designed to handle
For cats:
• Wet food minimum, fresh raw ideal — Scrumptious wet food (Buy 3 Get 1 Free), Big Country Raw cat formulas, Carnivora cat formulas, SMACK Cat (Winnipeg-made)
• Seal Oil daily — same DPA benefits in cats
• Wild salmon, sardine, or other high-taurine fish proteins as part of the rotation — Big Country Raw Wild Salmon Dinner, Perfectly Raw 4-PRO Fish, or COEVO Wild Shores all qualify
• Heart pieces as treats — cats love beef heart and chicken heart; naturally the most taurine-dense food
Heart disease cases — diagnosed or at-risk preventative — are exactly the kind of complex case where personalized guidance matters. Bring in your dog's diagnosis paperwork, current diet, and current medications. We'll help you build a complete protocol that supports cardiac health alongside your veterinary cardiology team.
📍 925 Headmaster Row, Winnipeg
📞 (204) 219-1928
This article is educational and is not a substitute for veterinary cardiology care. For diagnosed heart disease, always coordinate with your veterinarian.