Causes
A strong genetic component, made worse by overly rapid growth, being overweight as a puppy and inappropriate exercise during the developmental stage. Predisposed breeds: German Shepherd, Labrador, Golden Retriever, St Bernard.
Diagnosis
Physical examination plus specific hip radiographs. There are official screening schemes to support responsible breeding.
Treatment
Mild cases: weight control, appropriate exercise, physiotherapy, chondroprotectants and pain management. Severe cases: surgery (various techniques depending on age and case).
Prevention
Buy puppies from parents with screened hips, avoid your puppy becoming overweight, provide age-appropriate exercise (do not force jumping or long runs during growth), and feed a large-breed puppy food.

