Heart muscle disease (HCM)
The heart muscle thickens, so the heart pumps less well. The Ragdoll has its own inherited form. About 1 in 3 to 4 tested Ragdolls carries one copy of the gene; two copies are much rarer and carry the highest risk.
How it is found: DNA test of the parents and a heart scan by a specialist. Cats with two copies are not used for breeding.






