My female 13month (spayed) just started getting aggressive in the past 2 weeks. The first time I grabbed her collar to take her to her crate and she growled and snapped at me, did it to husband another time as well:( Never had crate issues before been using it since day one. Now just today I brought home a nuckle bone and she hid and when I get near her she growls and goes at me to bite, snapping and snarling. She did the same when my DH got near her too. I give her 2 raw marrow bones a week and have given nuckle bones before and she has never done this. Normally she will let me pet her head and even gets on the couch with me with it. Whats happening ? I'm very worried about this :( I have 3 kids and want to stop this behavior right away. She has not done this with her food and she is a only pet we have. She has had obedience and spends time with other dogs. Do I not give her bones anymore? Take it away? I have no idea what to do because its not all the time. Help please.