They're only 8 weeks. From 8-12 weeks their mother and littermates teach them not to play rough. This is the age where they are experimenting and their mom corrects bad behavior. Your breeder should have known that. Since they are already with you, do the best you can and nip the issue in the bud. They could just be playing, like puppies do, but when they reach a point where you think they're too aggressive, separate them as you have been doing. Good luck and enjoy your new puppies!
__________________ Littlest JakJak 
We miss you Kaji 
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