A rule of thumb is that 50 % of cavaliers will develop at least a very mild heart murmur by the age of five or six, and over 90 % will have a murmur by the age of ten. (rattlebridge.com)
She takes Enalipril, and Pimobendan for a mild heart murmur. (1800petmeds.com)
But, Sonic was diagnosed with a mild heart murmur and inflammatory bowel disease. (animalleague.org)