I own 3 labradors 2 male and 1 bitch, i bread one of the males with the bitch, she has had pups before but to a different sire, she had 4 golden pups and 2 black the next day 1 of the black pups were dead and the other black was on its way out it kept going stiff so id rub it then it relaxed then stiff again then died, the next day earlyhours of the morning one of the blonde one started doing the same and aldo weeing blood, so i hand feeded it but that died, the other 3 are all fine and healthy, im absolutelty gutted anyone had this problem before or no what it could be????