What causes heart murmurs in cats?
Feline heart murmers are basically when the blood leaving your cat’s heart as it gets pumped out or moving through the heart makes an unusual sound. Usually this is caused by some abnormality or defect, often in the structure of the cat’s heart. A cat’s heart murmurs are usually rated from Grade 1 to Grade 6. Grade 6 are the worst and most severe murmurs.