Male dogs may very well eat the newborn pups and should be kept separate from the pups until the demeanor of the male dog can be determined. Sometimes dominant females will takeover a litter or kill another females pups. The most loving and compassionate dog can suddenly change its demeanor due to instinctive reactions to stimulus. How a dog acts while it's owner is around compared to when it is alone can be very different. I have witnessed all the above behaviors first hand. The safest approach is to error on the side of precaution and to keep the mother and her pups separate from all other dogs.
