the solution

If you have more than one Dog that experience this problem, lies in leaving them to sort out their differences.

Usually, they don’t take long to resolve their differences. So, if you interfered only to expedite the solution, it will only

aggravate the problem, with no solution in sight.

http://lowflyingduck.com/Dog_Training/dog-obedience-training.htm
http://lowflyingduck.com/Free_Dog_Training/dog-obedience-training.htm