We recently got a rescue spaniel about 6 months ago. By watching him closely in new situations we discovered that he hadnt been properly socialised with other dogs or children. However, this has improved immensley since we got him. But there is one dog inparticular - a border collie male, that he is very aggressive towards. We meet it out on walks most days. My dog goes mad on the lead, pulls to get at him, barks and bares teeth. Up until yesterday the collie lay low or ran out of his way, and i kept pulling my boy on and telling him to leave. I know the woman that has him quite well and on occassions where it has been quiet, i have asked her to stand still until i do wide circles around her and get closer. This worked quite well, but it still doesnt stop the confrontation that happens every time we meet. Anyhow yday - for some reason the collie decided just to jump on him and they had quite a brawl and lucky enough we were able to get them separated. Does anyone have any advice on how to stop this aggression towards the collie? Do I put him in a down until the collie passes? help please!!