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Hello, I'm Dr. Deb and will do my best to help you today.
There actually are a few antibiotics which are considered safe for pregnant dogs although the list isn't an exhaustive one. The following are all listed as Class A drugs which means that there are no reports of adverse effects and they has not been shown to be harmful in pregnant laboratory animals.
Amoxicillin or Penicillins
Cephalosporins such as Cephalexin
I hope this helps. Deb