I have two 100 pound Akita/Collie mix dogs. Today on the walk we came across a possum who ran right in front of us. Both dogs started barking and whining and one of the dogs went after the other. I could not control both dogs so I released one for fear I may get bit. The dog I released did kill the possum but came back when I called. We continued on our walk but when we got back to the area where this happen they both started getting up and barking. I went into a jog and was able to readjust their attention but I am not looking forward to walking them together again. I usually do not have this experience when I walk them separately and I do walk them in prong collars. Any suggestions would be appreciated.