Pregnant shi-tzu

Question
I have a pregnant dog that is due anyday. Actually she is 3 days over due if counting the day she was bread. It has been 67 days.  She has had 2 previous litters with no complications.  She just pretty much spits them out like it is nothing.  Today though she is shaking alot(like she is scared) Could this be a sign that she is getting ready to have them finally?  She has always had the pups at my sisterin laws house so i do not know what is normal for her.  Just a little worried is all. Thanks

Answer
Pregnancy is 63 days plus or minus 5 days.

Best thing to do is monitor rectal temperature...usually they will whelp within 24 hours after temp drops below 100.

Make sure she has plenty of food (puppy food is best) as calcium levels can drop causing shaking or blood sugar levels can also drop causing shaking.

If she is straining to pass a pup and it is more than 30-45 minutes, get her to the vet.