Types of heart disease

Heart disease is classified as either acquired or congenital.

  • Most heart disease is acquired, not congenital4–6
  • Acquired heart disease can be due to valve problems (the vast majority) or heart enlargement1,4
  • Mostly small breeds develop mitral valve disease4,7
  • Mostly large breeds develop dilated cardiomyopathy4,8
  • A small proportion of acquired heart disease is caused by other conditions, such as heartworm infection and endocarditis

Click here to see a chart showing the percentage occurrence of the various types of heart disease.