Keep them separated. Too many times a big dog has killed another smaller dog over something that could have easily been prevented. Don't allow them near each other. Get a crate so when you aren't on top of him, he is confined. If he instigated a second, uprovokaed attack, then he isn't as innocent as you are making him out to be. Its an easy fix. Keep them away from each other.
Aiden vom HausDaka - IPO3x2, FH, CGC, TT
Carma vom Oz Haus - IPO1, CD