Diet does not prevent mitral valve disease in Cavalier King Charles Spaniels, and no special feeding is recommended for a Cavalier whose heart is still normal. What diet does is matter more as the disease advances: sodium, protein, calories and appetite all become part of treatment once the heart enlarges or fails. The American Kennel Club breed profile gives adults as 13 to 18 pounds (about 6 to 8 kg), with a life expectancy of 12 to 15 years, and notes that some Cavaliers are prone to becoming overweight.
Mitral valve disease in the breed
Myxomatous mitral valve disease (MMVD) is a slow thickening and deformation of the valve between the left atrium and left ventricle. The valve leaks, the leak makes a murmur, and over years the heart may enlarge and eventually fail. Many small breeds develop it in old age. Cavaliers are affected far more often, and the consensus guidelines single the breed out as especially high risk. In a review of UK primary-care records for more than 1,700 Cavaliers, a heart murmur was the most common disorder recorded, in 30.9% of the dogs.
The disease has a strong genetic background. When the Danish Kennel Club made heart screening compulsory for breeding Cavaliers, dogs bred under the scheme had 73% lower odds of a mitral murmur about a decade later. For anyone buying a puppy, the parents' cardiac screening results are worth asking for.
Vets stage the disease using the system in the American College of Veterinary Internal Medicine consensus guidelines:
- Stage A: a dog at high risk with no murmur yet. The guidelines give every Cavalier without a murmur as the example.
- Stage B1: a murmur, no signs, and a heart that is normal or only mildly enlarged.
- Stage B2: no signs yet, but enough enlargement of the left atrium and ventricle to justify treatment.
- Stage C: current or past congestive heart failure.
- Stage D: heart failure that no longer responds to standard treatment.
What diet does at each stage
The consensus panel is plain about the early stages: no drug or dietary treatment is recommended for dogs in Stage A or B1. Feed a normal complete diet, keep the dog lean and have the heart checked regularly.
| Stage | Diet | Other points |
|---|---|---|
| A and B1 | No special diet. Complete food, lean body condition, salty treats and table scraps kept to a minimum. | Yearly listening to the heart; echocardiography every 6 to 12 months once a murmur is found. |
| B2 | Mild sodium restriction. A palatable food with adequate protein and calories to hold ideal body condition. | Pimobendan is recommended at this stage. |
| C and D | Modest sodium restriction counting every source. Adequate protein. Enough calories to prevent weight and muscle loss. | Heart failure medication; weight and body condition recorded at every visit. |
Stage B2 is where treatment changed most in recent years. The EPIC trial randomized 360 dogs with preclinical MMVD and an enlarged heart to pimobendan or placebo. Dogs on pimobendan stayed free of heart failure for a median of 1,228 days, against 766 days on placebo, and lived longer. The diet at this stage supports that treatment; it does not replace it.
In heart failure, the guidelines give specific feeding advice. Losing muscle (cardiac cachexia) worsens the outlook and is much easier to prevent than reverse, so calorie intake has to be kept up, at roughly 60 kcal per kg of body weight a day as a starting point. Warming food, mixing wet with dry and offering some variety can help a dog with a poor appetite. Protein should be adequate; low-protein kidney diets are to be avoided unless the dog also has serious kidney failure. Sodium should be modestly restricted counting all of it: dog food, treats, table food and anything used to hide tablets, including cheese, ham and bread. Omega-3 fatty acids from fish oil are worth considering in dogs with poor appetite, muscle loss or arrhythmias.
Water and breathing: never restrict water for a dog on heart medication, especially diuretics. An increase in the resting or sleeping breathing rate above the dog's normal baseline is, according to the guidelines, the best early predictor of worsening heart failure. Count breaths while the dog sleeps and call the vet if the rate climbs, or at once if breathing is labored or the dog coughs, faints or cannot settle.
For a Cavalier with a normal heart or an early murmur, the guidelines recommend no special diet, only a lean dog and regular heart checks. A personal plan can set the portions.
Build your dog's personal food plan →Taurine and other supplements
Taurine is often promoted for Cavaliers. Taurine deficiency is linked to dilated cardiomyopathy, a disease of the heart muscle, not to the valve degeneration that affects this breed. There is no good evidence that giving taurine to a Cavalier on a complete diet delays MMVD, and the consensus guidelines do not include it in their dietary recommendations. The same applies to coenzyme Q10, L-carnitine and antioxidant blends. A dog with a heart diagnosis should only start supplements agreed with the vet or cardiologist, because some products add sodium, calories or interactions with medication.
Calories and body weight
A small, food-motivated dog on a sofa does not need much. The Merck Veterinary Manual gives resting energy requirement (RER) as 70 times body weight in kilograms raised to the power 0.75, multiplied by about 1.8 for an intact adult dog, 1.6 for a neutered adult and 1.4 for one that gains weight easily.
| Lean adult weight | RER | Intact (1.8) | Neutered (1.6) | Gains easily (1.4) |
|---|---|---|---|---|
| 5.5 kg (12 lb) | 250 kcal | 455 kcal | 400 kcal | 350 kcal |
| 6.5 kg (14 lb) | 285 kcal | 515 kcal | 455 kcal | 400 kcal |
| 7.5 kg (17 lb) | 315 kcal | 570 kcal | 510 kcal | 445 kcal |
| 8.5 kg (19 lb) | 350 kcal | 625 kcal | 560 kcal | 490 kcal |
Figures are rounded to the nearest 5 kcal and apply to healthy adults. A dog in heart failure is fed to hold its weight and muscle, as above, and its needs are set with the vet. At ideal weight the ribs are easy to feel with light pressure and there is a visible waist from above. In a dog this small, a few hundred grams is a real change, so weigh monthly.
Weight matters in two directions. Extra fat is no help to a dog that may later need to exercise with a leaking valve, and it makes body condition harder to judge. But in advanced disease the bigger danger is losing muscle, so a Cavalier in heart failure should not be put on a weight-loss plan without the cardiologist's input.
Syringomyelia and mealtimes
Syringomyelia is a condition in which fluid-filled cavities form in the spinal cord, linked in Cavaliers to a malformation at the back of the skull. It is common even in dogs that show no signs: in German Cavaliers screened by MRI, 48% of clinically unaffected dogs had syringomyelia, and the odds rose with age. Signs include scratching at the neck or shoulder without making contact ("air scratching"), yelping, sensitivity around the head and neck, and reluctance to be handled there. A dog with these signs needs a vet assessment; pain relief and specific drugs are the treatment, and diet has no proven effect on the disease itself.
Mealtimes can be adjusted for comfort. A dog that seems uncomfortable lowering its head may eat more easily from a bowl raised a little on a stable stand. Softening kibble with warm water, or feeding wet food, helps a dog that hesitates over hard food.
Teeth
Cavaliers are also prone to dental disease. In a UK study of dogs under primary veterinary care, the Cavalier King Charles Spaniel had 2.39 times the odds of periodontal disease of crossbred dogs. Daily brushing with a dog toothpaste is the best home care. Dental chews add calories and sometimes salt, so count them, and check the label if the dog has a heart diagnosis. Dental procedures under anesthesia in a dog with heart disease are planned with the heart in mind, which is one more reason to prevent tartar build-up early.
Practical feeding points
- Meals: two measured meals a day, dry food weighed on a kitchen scale.
- Treats: count them in the daily calories. The AKC advises giving table scraps sparingly, if at all, and avoiding fatty foods and cooked bones.
- Hidden salt: cheese, deli meat, bread and many commercial treats and pill pockets are salty. For a dog in Stage B2 or beyond, ask the vet for low-sodium ways to give tablets.
- Heart checks: the guidelines recommend yearly listening to the heart by the family vet for predisposed breeds, and note that owners of high-risk breeds such as Cavaliers may choose screening by a board-certified cardiologist.
- Food changes: gradual, over about a week, and discussed with the vet if the dog is on heart medication, since some therapeutic diets change electrolyte intake.
Sources
- Cavalier King Charles Spaniel dog breed information. American Kennel Club.
- Prevalence of disorders recorded in Cavalier King Charles Spaniels attending primary-care veterinary practices in England. Canine Genetics and Epidemiology, 2015.
- Breeding restrictions decrease the prevalence of myxomatous mitral valve disease in Cavalier King Charles Spaniels over an 8- to 10-year period. Journal of Veterinary Internal Medicine, 2016.
- ACVIM consensus guidelines for the diagnosis and treatment of myxomatous mitral valve disease in dogs. Journal of Veterinary Internal Medicine, 2019.
- Effect of pimobendan in dogs with preclinical myxomatous mitral valve disease and cardiomegaly: the EPIC study, a randomized clinical trial. Journal of Veterinary Internal Medicine, 2016.
- Nutritional requirements of small animals. Merck Veterinary Manual.
- Prevalence of syringomyelia in clinically unaffected Cavalier King Charles Spaniels in Germany (2006-2016). Tierärztliche Praxis Ausgabe K, 2018.
- Epidemiology of periodontal disease in dogs in the UK primary-care veterinary setting. Journal of Small Animal Practice, 2021.
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