A dogs gestation period last from 58 to 65 days with 63 days being the average length of time from a successful mating. Do you know when she was bred?
A week or so before she is due she will become restless and start to look for a secluded place in the home. At this time you should provide her with a whelping box placed in a quite area of the house. Place some cloth or paper material in the box. She will rip this material apart in the whelping box to creat herself a nest to deliver her pups. Make sure the box is large enough for her to move around in and the sides are high enough to keep the pups inside.
Her body temperature will drop to 100deg or below twenty four hours before she will deliver her pups.
You can buy a rectal thermometer at any pharmacy and use it to determine her temp.
If you are noticing regular contractions but no puppy is presenting itself in an hour or so, then she needs to be seen by a vet immediately. One of the pups may be in a position where it is blocking the birth canal.
I hope this info helps. Let me know if you have additional questions and good luck with mom.

