I assume you know their gestational period is about one month, it's a shame you don't know the date the buck was with them. As none of us here are rabbit breeders or vets you really do need to get professional advice from a vet. Aggression is very common in pregnant rabbits though. Marko's advice to put the rabbits where the dogs can't bother them is good, if the mothers are stressed they may well kill their kits.
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