
If the bitch is not distressed,a dn you can feel puppy movements so it isn't as if there is something amiss.
What says in ehr cycle was she mated? What is the usual gestration length in her breed and female line? did her motehr go over dates?
Could she have conceived much later than she was mated (bear in mind semen can live iwthin the bitch for up to a week).
Bitches can go a week before and also be late, generally a large litter will trigger whelping earlier.
Has the vet checked her and the state of the pups?