I just heard from the akc regarding whether dogs should be entered in Advanced and Excellent A or B. I asked this question to make sure it would be OK to show both boys in A after Novice, because neither of them has an obedience title. This is the response I got:
So, you all were right (of course)! Just thought I'd let you know what the AKC said.Hello,
You are correct that a handler can enter the Advanced and Excellent A
classes regardless of their experience with other dogs in the past. As
long as the dog you are currently competing with has not earned any
obedience titles, you can compete in the A class. If you get an RA
title on the first dog, you can remain in Advanced A with the other dog,
you will not need to move the second dog to the B class.