I have 2 dogs my sister has 3 and I watched all 5 for a few weeks.The first thing to do is (if you save 1 from a rescue give him a good bath) a long controled walk start out with 1 dog on either side of you after they get in the zone (ears back head down focoused on migration) then bring them side by side and keep going walk at a good pace you may have to correct 1 or both as you go dont let 1 in front of the other YOUR THE BOSS walk them till they are tired then let them sniff and meet . dont let them meet face to face with out a good walk it could cause trouble. that has worked for me many times. after some work I was able to walk a 100lb germen sheperd , 80 golden,60lb pit,60 blue heeler,and a 30lb spanial mix all at the same time and they live together with no real problems.You can do this it will take some time and work but worth every bit.GOOD LUCK