My dog is a 4.5 month old female. We have successfully completed puppy kindergarten where she did well but was obviously nervous. I have taken her out near people and have maintained a level of training and expectation. I noticed that she was developing a fear reaction of lunging and barking especially at men (strangers). I called a private behaviorist and have an appt. For this coming Thursday. THE PROBLEM....today she actually barked, lunged and bit. Please before we get into bloodline and all that....I am new to this breed and maybe didn't ask all the right questions but that being said I am a good and responsible pet owner. I love my dog. But...I cant. Take a r idk that she will harm someone. Is this problem fixable or should I be looking for a new home for her or God forbid....should she be put down? My heart is breaking.