my 3 month old yorkie is so mean.she bites all the time when you play with her.i tell her no an no bite then i put her down an don't play with her.but she keeps doing it.an when my 3 year old son is home she chases him an bites his legs or cloths making him cry.at first i just thought o shes a puppy but now i'm startig to worry that she wont stop bitting some one please help me.