A retrospective epidemiological study of canine and feline cardiovascular diseases was done based on the data from 1421 dogs and 100 cats, all of which visited our hospitals with cardiovascular problems during the past 19 years. The total number of dogs was 1648, and the percentage of congenital heart diseases, acquired heart diseases, and cardiomyopathy was 7%, 92%, and 1%, respectively. Of the congenital heart diseases, patent ductus arteriosus, aortic stenosis, ventricular septal defect, pulmonary stenosis, atrial septal defect, and tetralogy of Fallot accounted for 28%, 18%, 15%, 12%, 12%, and 6%, respectively. Dilofilariasis, the most common heart disease in dogs, accounted for 52% of all acquired heart diseases. Following dilofilariasis, mitral regurgitation (MR), tricuspid regurgitation (TR), and caval syndrome (CS) accounted for 32%, 15%, and 6%, respectively. MR and TR were seen more frequently in small breeds, and the peak occurrence of MR and TR appeared after age 10. The peak of CS occurred at age 5, and the disease progressed to cause abnormality of the pulmonary artery and insufficiency of the right heart. The peak of these severe cardiovascular conditions occurred at age 7. Cardiomyopathy was more common in dogs younger than age 10. In a total of 103 feline cases, congenital heart diseases and cardiomyopathy occurred in 38% and 48%, respectively. Cardiomyopathy was found in male cats twice as frequently as in females.
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