Poultry vitamins would be good for extra support. Could take up to a week just depends but keep him from running around much water therapy is the best because it lets them move but keeps pressure off the foot. Try to soak his legs in a bucket of warm Epsom salt water at least 1X a day 2 if you can. But remember he can't drink the E-salt water it also works as a laxative. If you think there maybe more than a sprain and you can do it take him to the vet.How long does it usually take for a sprang to get better? Should i be giving him extra vitamins or anything?