We adopted Morgan our 4 year old corgi about 4 months ago from a friend. We would bring her to the dog park and she enjoyed the company of other dogs. We decided to get a corgi puppy because we knew she got along with that breed. We got Marley about a month ago, he is currently 5 months old, and we had a little trouble with Morgan accepting him. She would pretty much growl if he came near her, etc. She never attacked him or anything in the beginning. She seemed to bond with him the last few weeks and then all of a sudden this week there has been numerous incidents where she will attack him. Sometimes its provoked by him growling at her and sometimes its not. The last time she got to him, she bit his lip pretty good and he was bleeding for a while. I know as her grows this problem will just get worse if something is not done about it. She seems to be afraid of him (she will hide her head when he looks at her, wont come sit with me when hes around) so its more of a reaction of fee then wanting to be the dominant one. Has anyone had this problem or any suggestions on tips I could use to turn this situation around?