Heart murmur and hypertrophic cardiomyopathy (HCM)
A heart murmur is an extra sound in the heartbeat. It can be harmless, or a sign that the heart muscle is getting thicker (HCM). Over time that can weaken the heart. It is reported in Toygers, but how often it happens is not known.
How it is found: A heart scan of the breeding cats. There is no DNA test for the Toyger.

