Norwegian Forest Cat vs Ragdoll

This breed is marketed as a hardy, naturally-evolved landrace with few health problems, which is true for most individuals, but it carries a rare fatal metabolic disease that kills affected kittens in infancy or early kittenhood, and Cornell's feline health center also lists it among breeds with elevated hypertrophic cardiomyopathy risk — a DNA test exists for the fatal condition and there is no excuse for a breeder not to use it.

Ragdolls are sold almost entirely on their limp, placid 'floppy' temperament, but that same breed carries a specific inherited heart-disease mutation, and a cat that goes limp when picked up is not proof of good health — it can just as easily mask genuine lethargy from undiagnosed heart disease.