| Mindy, our resident expert is not online at the moment. Do you have a vet? If so, you need to call their emergency contact number. If you call their office, they should tell you how to contact the vet on call. If you do not have a regular vet, call a local vet, and do the same thing.
I wish I could tell that there should not be cause for concern over his eating 1 pill but I do not know how large your dog is and since he is a puppy, I am advising you as if this happened to me. It would be the first thing I would do.
Under no circumstances should you try and make the puppy throw up unless the vet gives you instructions to do so. | 
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