My pup is the same way. She's five months next week. Most of the time I can't even pet her without her turning into a crocodile, snap!! snap!! snap!! She bites my arms and pulls, no matter how many times I try and replace it with some thing she's allowed to bite she prefers my flesh. Unless I actually actively engage her in a game of tug, then she goes for the toy. BUT I am very lenient with this because I am doing French ring (bite work) with her. I'm not sure if I would be quite this lenient if she was a pet dog, but then again it seems like it's truly something they just grow out of. Keep a toy on you at all times. Even a rag and when She bites redirect her toward a game of tug with the rag or toy. This too shall pass, we are right in the middle of teething.
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