lately, the issue hasn't been her crying when i leave, but biting and nipping at people for what seems like no reason at all. if i sit down to eat, she will usually get up from eating her own food and run full speed at me barking. if i point my finger and say "no" she nips at the finger. she does this to everyone else as well and i know that it scares people like my grandparents who dont expect her to be nipping and snapping at them. whenever they attempt to correct her (me as well) by point a finger in her face (i dont know how else to correct her or if this way is right) she barks and nips at the finger. it just seems like a complete turnaround from the playful lazy puppy from two weeks ago. it just seems to me that she thinks she is in complete control and by barking and throwing tantrums she is going to get what she wants. she also runs circles around me when i take her outside to go to the bathroom when i attempt to bring her back in. it seems to me that her ego has inflated over the past few weeks and i lost any power i had over her. i feel like an awful parent because im so lost. i dont want to lose my temper or have other people view her as overly aggressive. should i be doing obedience training classes with her right now? (10 1/2 weeks) ?