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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
So it wounds like the 9 week old puppy you purchased has a distended tummy, but is otherwise doing okay right? Good appetite and no vomiting or diarrhea?
Puppies can get a distended abdomen from a few causes. The most common is worms. It sounds like the breeder gave a dewormer, but it might take more than one deworming to get rid of parasites. It is also possible that the dewormer she used was not appropriate for the type of worms that he has. Are you going to take him to a veterinarian for a health check? If you do they will recommend a dewormer and a fecal evaluation to make sure they are using the right dewormer for your puppy. They can also get a distended abdomen from over eating or from fluid in their abdomen due to malnutrition. If he is eating and passing stool normally these things are less likely.
As long as he is not acting sick or painful then I would just let him drink as much as he wants, feed him small meals several times a day rather than large meals twice a day. And take him to a veterinarian for a fecal when you can. If he is feeling sick then I would be more worried.
I hope that helps, but if you have more questions let me know.
If you thing she has over eaten then the small meals will help... it will give her more time to digest food an it won't swell in her stomach so much.