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This is the perfect time to get her flea free before whelping. Your first step will be getting your dog on a flea preventative to get the fleas off of your dogs if they are not on it already. The second table on this chart gives you a couple of choices for a dog that is pregnant or lactating.
If that is not an option or in addition to that, washing your dog in dawn dishwashing liquid, leaving the lather on for 15 minutes before rinsing will kill the fleas. It will not kill the eggs though. So you will need to repeat unless you get your dog on a preventative. The second step will be ridding the environment of them.
There are quite a few house sprays available to control fleas in the house. I've used Flea Stop but any that include a growth inhibitor should do the job pretty well. Cutting a piece from a flea collar and adding it to your vacuum bag will kill any fleas that you vacuum up and prevent them from escaping back into the house. Vacuum every day for at least a month to get all the fleas and eggs out of the carpets.
You can also treat the yard if you wish with food grade Diatomaceous earth, which helps kill them in the yard without poisons. This can also be used in carpets as well. You can read more about that here.
I'd suggest bathing her as soon as possible just in case she goes into labor early.
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