Wow, that is terrible on the seller's part, and I would be livid. Ian Dunbar has some good books dealing with these issues, especially teaching bite inhibition that littermates usually help the pup understand. Mainly, try to get the pup to see that using teeth too hard means fun ends. You shouldnt try to stop all biting at this age, as you want the puppy to get how to gentle the use of his mouth. Try feeding peanut butter on a metal spoon or horse's snaffle bit so the pup has to gentle that mouth to avoid clanging. Yip like a pup and turn away and cease playing if a bite is too hard. Also, if you can find a super gentle, well-vaccinated older dog for playdates, that will be an immense help. There is so much good you can do here, but this window of time is crucial ( until about 12 weeks). Introduce pup to 100 friendly people, 20 dogs, walk on 12 surfaces see funny hats, kids, wheelchairs- anything he might encounter in his life, starting slow but increasing at 8-12 weeks.
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