We use a digital thermometer; the butt is the way we do it. We use the plastic sleeves on the thermometer and wash and disinfect between temps. Generally, when she is getting very close (within maybe 12 hours or less) she will start nesting (digging and and routing around) and panting.

That's great that you have assisted; that will help a lot. Definately get the video and get a book too. Oh, and if you take her outside for a break between puppies, always have her on a lead and carry a flashlight and towel. We have had 2 or 3 puppies born outside over the years.

After the puppies are born, we feed the mom a couple slices of cheese to keep the calcium levels up after a breeder friend lost her mom to eclampsia when the puppies were just 1-1/2 weeks old.

If theres anything you're not clear on after watching the video and reading, just ask. I'll help as best as I can.