behavior

Hi everyone, I am brand new to this forum, so please bare with me! I have a 9 year old male Cocker, hes an amazing dog, I love him so much........ But I am becoming increasingly worried about his aggressive behavior, over the last 12 months he has developed possession aggression, not sure how...

It seems that Otto has some baggage that he needs to get rid of. Our thinking is that he has been hit by someone before. (may go so far as to say beat) :( A couple of instances: They get a carrot piece in the afternoon after they go out to potty. I have Ellie and Otto sit on a throw rug in...