never bred a litter myself mate so as for looking after the dam and giving supplements i wouldn't know,but when choosing a pup,well easy in my eyes,do you want/prefer dog or bitch,now at least you have a start point,general health and well being,ie teeth feet etc as said,there will usually be one that really catches your eye,weather it be boisterous/playful or just that little something that you know when you see it,i dont pick one that may constantly shy away and generally be disinterested in anything going on,but not necessarily the trouble maker of the litter lol,and yes colour does play a