Hi. We adopted a male Golden Retriever one year ago. We then adopted a male German Shepherd in February of this year. They both turned one in September of this year. Most of the time they play with no problems. Sometimes it looks a little rough, but no fighting. I noticed that my Golden Retriever will snarl and growl at the German Shepherd sometimes and then they will jump on each other and fight. There is usually no blood (only once when the Golden's foot pad was bleeding)just terrible growling and thrashing. I think they are competing for top dog. My daughter's 3 year old black Lab mix also lives with us. He is top dog and the other two respect that. I do not know how to stop the younger dogs from fighting. Help!