I would think Bo is not giving the pup the message as he knows you don't want him giving her the chomp. You really need to set up the pup so she starts biting Bo and you can step in and give her the "no" or "leave it" command. I would also be encouraging Bo to "get her" and while your holding her down get him to come up and sniff her and then stand over her while your holding her in the submissive position. You need to let Bo know he can discipline her then he can sort it out himself. Playfighting with her yourself can be good as well and if she starts biting you can let her know that level of play is not acceptable.
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