I really think, that in time, these two dogs WILL find their way with each other, i do. I could be wrong, but it could just be the adjustment thing of new dog in my house kinda thing.. It might be easier, to teach Chance an alternate behavior, and REWARD that, rather than punish him. One option might be: 'Go to your MAT'. It's fine if Chance has frozen kongs, chewbones, etc, and puppy can't be allowed to approach Chance if he is on his mat, and if Chance corrects the pup for coming into his space, is a good chance that the JR is right. Of course, keeping a JR on a mat for very long, is not sustainable solution , but, it *might* be something to consider doing briefly just to interrupt escalations....make sure Chance sees his mat as "best place in the world" and NEVER ever send Chance to his mat as a punishment, or he will hate that mat. Reward him HEAVILY for being on his mat. only first few minutes are about one way to teach "go to your mat", rest of video is advanced stuff.