Various health issues affect this particular breed. Cavaliers are also affected by ear problems, a common health problem among spaniels of various types, and they can have such other general conditions as hip dysplasia, which are common across many types of dog breeds. Nearly all Cavaliers eventually have mitral valve disease, with heart murmurs which may progressively worsen, leading to heart failure. A survey by The Kennel Club of the United Kingdom showed that 42.8% of Cavalier deaths are cardiac related. This disorder can decrease or heal over time.A 1999 study of Cavaliers conducted by the Canine Eye Registration Foundation showed that an average of 30% of all Cavalier King Charles Spaniels evaluated had eye problems. They include hereditary cataracts, corneal dystrophy, distichiasis, entropion, microphthalmia, progressive retinal atrophy, and retinal dysplasia.
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