While heart disease is usually not curable, as a pet owner you can incorporate some simple dietary changes that when used in combination with medical therapies can ensure your dog has a good quality of life.
Sodium restriction is usually the first dietary change that is recommended for patients with heart failure because the condition tends to lead to salt and water retention. Typically, many commercial brands of pet food have relatively high salt levels. Pet treats can also be high in salt and should be avoided. Other minerals important for heart health include potassium and magnesium. It is important to supply the correct levels of these essential nutrients in the diet for optimal effect.
Protein should not be overly restricted in dogs with heart disease and the calorie content of the food needs to be appropriate to maintain your pet's ideal body weight. Excess body weight results in increased work requirements for the heart, while too little energy is also deleterious.
Omega-3 fatty acids may be useful in some patients with heart disease as they may help to reduce inflammation which may ultimately reduce the risk of muscle wasting and heart rhythm abnormalities.
Whilst there are some important dietary changes you can make for your pet suffering heart disease, it is important that such changes are done in the context of providing an overall palatable and nutritionally balanced food. There are a variety of commercially available therapeutic diets available through your veterinarian, which are specifically formulated to meet all the nutritionally requirements of particular medical conditions. Speak to your veterinarian about any specific dietary changes you may need to undertake to maintain your pet's health.