Males: 120–170 lb (54–77 kg): average 140–150 lb (64–68 kg) Leonbergers in UK and USA/Canada surveys had a median lifespan around 7 years, which is about 4 years less than the average purebred dog, but typical of similarly sized breeds. About 20% of Leonbergers in the surveys lived to 10 years or more. About 20% of Leonbergers in the surveys lived to 10 years or more. The oldest dogs in both surveys died at about 13. In France, the breed has a median lifespan of 8.75 years.Serious diseases can affect the Leonberger—certain types of cancers are very common in the breed. In a 2000 USA/Canada Leonberger Club of America survey, the most common causes of death were cancer (37%), old age (12%), cardiac disease (9%), and 'sudden death' (8%).Studies have indicated problems with inherited polyneuropathy in certain populations of Leonbergers and cataracts in dogs in the United Kingdom.
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