If you have a mixed breed you still can compete in all of the AKC Companion events such as agility, obedience, rally, tracking, coursing, dock diving, flyball, barnhunt, etc. If your dog is spayed/neutered you can apply for an AKC Canine Partner number.
You can enroll at a NADD Dock Diving Trial for $19. Include the AKC Canine Partners Enrollment App, your NADD title and The AKC Recognition Form to the AKC.
You can also enroll your dog by printing the AKC Canine Partners – NADD Diving Dogs – Enrollment App and emailing it with the payment to: firstname.lastname@example.org
For more information you can go to the AKC Canine Partner page.