We have a 12 week old puppy,we purchased her from a reputable breeder. We did all the research,contacted references,etc. Recently our female puppy has been growling if the children come around her food dish, or if someone tries to take something from her. As soon as we brought her home we had the kids petting her and feeding her and being near her while she ate. We also had them take toys from her,never a problem before. Now she is actually growling and snapping. I'm very concerned. I contacted a trainer but the trainer won't be able to come out for another week. I'm at a total loss as to why she would be doing this.