LOL...too easy.

  1. Type /pitbull
  2. Scroll down in the left pane and click on "Raid"
  3. In the right pane, check the "Disable" box.
  4. Repeat step 3 for the "Raid Pets" item.
Voila!

FYI, this is what my UI looks like while in a raid. [edit] Oops...it's missing the big button just below the party/pet targets that's the TargetTarget box. :P