We have a mix of B. Saanen, B. Togg. and Togg. they all get on quite happily , the one thing you need to be aware of is the goat greeting headbut, this can turn into a heirachy selection thing that can look a bit violent, so if you mix small breeds with big meaty ones you might find it getting out of hand and end up with injured animals, but on the whole our big ones do it so gently to the youngsters that it can be quite sweet to watch.