I double-checked to make sure I wasn't spouting rubbish but I was right in my earlier post. The rescue I assist doesn't do weekend fostering as it has been tried and found that it worked only for those dogs that weren't troubled by kennel life anyway. Those dogs that didn't do well in kennels - who one might have thought would get the greatest benefit from a weekend break - were adversely affected by the change and change-about often finding kennel life even more distressing (refusing food and other stress symptoms) when they returned.