So... recently Holly has started to become a bit nippy when she is excited or frustrated (eg, when I get home, when doing tricks). I think she is naturally a nippy dog (she was nippy when we got her and would bite hands until I stopped everyone playing rough games with their hands with her), apparently her sister is nippy and Holly is very mouthy when playing with our other dog. But she has really got bad lately. I tought her how to weave around my legs so she sometimes tries to bite my pants while doing it So my question is: is this an age thing that she will grow out of if it's ignored (she is also sometimes ignoring commands now, especially recall) or is it something else? She is 6 and a half months old now so maybe she is just at a stage where she is naughty?