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Hello, I'm Dr. Deb and will do my best to help you today.
There actually are several safe wormers to treat the most common internal parasites which dogs might contract and which can be given to pregnant females or even after they've delivered their puppies:
1. Pyrantal Paomate which goes under different brand names such as Strongid, Nemix or Evict. This is a very safe and effective wormer for round worms and hook worms. The dosage amount will be indicated on the label based on the body weight of the dog.
This product is available at just about any pet/grain store or can be purchased online.
I dose every two weeks for three doses or it can be given weekly.
2. Fenbendazole (aka Panacur) which may be available online without a prescription (I've seen it both ways on different websites). It's effective against round worms, whipworms, hookworms and some species of Giardia.
It's given three days in a row.
I hope this helps. Deb