Hello, I am fairly new to raising ducks. I bought 2 runners and 2 mallards, but recently a neighborhood dog tried digging into their enclosure and the two mallards got frightened and flew away. One of them came back, but the other is still gone so now it's the one mallard and 2 runners. So my question is, should I get another mallard to keep her company, or will she be happy with the runners? I know they are social creatures but I wasn't sure if any old duck is fine, or if they prefer to hang out with their own breed. Any advice would be appreciated. Thank you!