mDNSResponder not logging
In my opinion parts of the log system of macOS 10.12.0 are flawed.

The output (dump) of sudo killall -INFO mDNSResponder is visible in the Devices > $hostname  "log" though.

First launch Console and choose your host device in the left pane. Enter a filter like mDNS in the search field at the top.

Then enter  sudo killall -INFO mDNSResponder in Terminal and watch the results fly past in Console.