First of all do you have fleas?
If you do, the Zodiac spray is great for your house and rugs but be very careful not to get any near your dogs. Follow the directions on the can. There are other products out there that are safer but do not work as fast as the Zodiac products.
Next if you do have a flea problem now you may also have tape worms, and you will need to check with your vet to help you with this problem. It is very important to be flea and worm free for the health of your dogs and new puppies.
Using a flea product on a dog that does not have fleas is not a good idea as the flea products may be a bit drying to the skin and coat. Using human shampoos can do the same thing sometimes as they are not PH balanced for dogs and if you are not careful can burn and blister the dogs eyes. Dawn dish soap does work pretty well for killing fleas, just make sure you get it all rinsed out and you do not leave any on the nipples for the puppies to nurse off of.
Four pounds eleven onces is very small, I hope eveything goes well for her.
Dray
www.sumtoiyorkies.com