I suffered a full dislocation while whitewater paddling roughly 24 years ago. My shoulder was out for about 8 hours, a result of walking out of the river, finding a ride to the hospital, and difficulties in getting the joint reset. Anyway, years later I only have minimal problems and have never suffered another dislocation. My biggest set back is I can no longer throw or perform similiar motions, no more snow ball fights.
Paddling is no problem and key to this was an effective rehab program administered by a physical therapist familiar with paddle sports. After being in a sling for six weeks, I started an eight week rehab program which was very beneficial.
That was followed up by doing regular shoulder strengthing exercises similiar to these suggested by Davey Hearn, a US whitewater canoe slalom champion.
www.daveyhearn.com/Coaching/Technique/Ro...shoulder_routine.htm
I think the key is to find good care and rehab program, continue exercising the effected shoulder (and the other side), and to maintain the routine even when you think you are fully recovered.
Good luck