So my pup is about 9 months old now and she has decided to stop listening. She used to be very good with sitting and waiting and being calm and not barking when people came in the door or while someone was in the driveway and it's like she threw it all out of the window. She is also now jumping to take toys and treats out of my hand, barking and groweling at people in the house and getting a little nippy. What can I do to combat this? Do I just need to carry on with training and wait for her to grow out of this?