dogparkSDR - enable Mac Audio and turn off TX DAX in the dogparkSDR Radio prefs, select None for DAX in the Slice prefs...
Create a default Virtual Device (Loopback Audio) in the Loopback application.
It is usefull but not necessary to create a Monitor in Loopback so that you can hear what is passing through it.
Set Loopback to 48 K with Utilities/Audio MIDI Setup, if you have a problem with transmit try the default 44.1 K.
Select Loopback Audio for input and output in the dogparkSDR Audio prefs.
..as well as in WSJT-X Audio prefs.