Half the trick with displaysia - and arthritis - is to excersise in an appropriate way. Ideally, gentle and often. You must try to keep surrounding muscle healthy, fit and strong and mobilising the joints is essential. Long periods of inactivity make the pain on moving worse - leads to loss of interest in getting up - leads to inactivity - leads to more pain on movement..........
Paddy suffered abuse until he was two and is now showing the first physical signs of stiffness after resting, some pain for the first few steps, that kind of thing. It is minimal - nobody else has noticed it - I have started getting him up every half hour while I am home to warm up and move the joints. I have traded my lunch break for two extra 15 minute breaks when I can rush home and get him up and moving during the day (I know I'm lucky living that close to work).