In the United States, a typical mature male weighs 50 lb (23 kg), while mature females weigh about 40 lb (18 kg). The Bulldog Club of America recommends the average weight of a bulldog to be 40–50 lb (18–23 kg).Bulldogs are one of the few breeds whose tail is naturally short and either straight, screwed or thin and thus is not cut or docked as with some other breeds. A straight tail is a more desirable tail according to the breed standard set forth by the BCA if it is facing downward, not upwards. The UK Bulldog Breed Council website lists the average life span of the breed as 8–10 years.Statistics from the Orthopedic Foundation for Animals indicate that of the 467 Bulldogs tested between 1979 and 2009 (30 years), 73.9% were affected by hip dysplasia, the highest amongst all breeds. Similarly, the breed has the worst score in the British Veterinary Association/Kennel Club Hip Dysplasia scoring scheme, although only 22 Bulldogs were tested in the scheme.
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