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Legg-Perthe's disease is a degeneration of the hip joint occurring in young dogs. It is also known as Legg-Calve-Perthe's Disease, Perthe's disease, Calve-Perthe's disease, or in medical terminology, avascular necrosis of the femoral head and neck. The former names recognize the original researchers in the disease as it occurs in humans.

Legg-Perthe's disease (LPD) occurs most frequently in dogs 5 to 8 months of age, with a reported range of 3 to 13 months. It occurs primarily in small dogs, and has been reported in many small and toy breeds, including Italian greyhounds. Affected dogs are normal prior to the onset of the disease. Symptoms of LPD are lameness, and pain in the area of the affected hip. In some cases, the symptoms may be mild, and possibly go unnoticed. Upon examination, pain can be elicited by a skilled examiner by moving the hip in a variety of directions.

Prevention of the disease is only possible through genetic means. Affected animals should not be bred or shown. Breeding stock should have their hips X-rayed to insure that they are not affected with mild LPD, the symptoms of which went unnoticed during the dog's adolescence. It is easy for a judge to determine this surgery as all they have to do is put their thumbs on the hocks of these corrected dogs and gently extend their legs and it is obvious that one leg is shorter than the other by about an inch.

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