Ok - now I am with you...
Just like people, without a vaginal examination, there is no way to look for dilation.
With that said, here is some information for you to help with knowing when she may give birth.
Typically a dog pregnancy is 63 days - so around this time you should pay careful attention to her signs.
Secondly, when the due date is approaching, you can take her rectal temperature. A dogs normal temperature is 100-102.5 degrees. When the temperature drops below 100 degrees, you can likely expect labor within 24-48 hours.
Finally, when it is getting very close, your dog may appear restless, pant, pace around the room, and even shake
I hope you find this information helpful!
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