I am not sure but if Mac OS X can accept internet sharing then try this.
Go to
Motorola Q Forum | Everything Q - View Single Post - Tethering Moto Q 9H with AT&T
Download ICS.zip file (you probably need to register first)
unzip the ICS.zip and you will see a file inside named "URPREY-ICS.cab"
Transfer that cab file to your Moto Q9h run URPREY-ICS.cab and it will install a shortcut on start menu called Internet Sharing or something like that. AT&T orders Moto to remove shortcut so people can't tether to laptop so that why you install to put shortcut back on.
Connect USB to laptop then click on Internet Sharing in Start menu
But again I am not sure if MAC can do ICS but I think I did read on forum that Mac can do support ICS so it doesn't hurt to try out and see and let us know if it works or not!
Good Luck!
Oh one more thing I am on TAP plan and I tether a lot when I travel so beware if you are not on TAP and I don't know if AT&T will charge you extra for tether on regular plans. I never got extra charge on my TAP plan for tether to my laptop thou. So just to warn you in advance.
.