HELP! A little over two weeks ago we adopted a 5 month old lab beagle mix named Harley. He learned sit stay look at me leave it alone and come in just 4 days but he has crazy mood swings! One minute we will be fine sitting on the couch i wont even be touching him and he attacks me, not in a friendly puppy biting way but hard biting where i have had to pry his jaw off of me hes growling. I have tried giving him a chew toy telling him no went to a training class and nothing is helping im just at my whits end i have bruises all over my arms hands and legs cuts and puncture wounds from him. Today i had to pry him off of me and run into another room as he growled and barked and scratched at the door trying to get in. I have raised many dogs including 3 rotwilers 2 golden retrievers and a pit bull and i have never experienced anything like this. I really don't want to give up on him we are his 3rd home already and he is very good most of the time but i fear those moments when he becomes uncontrollable and violent. He gets plenty of exercise we take him on 3walks a day play fetch and tug of war. I just don't know what to do I could really use your advise!