I just got the program announcement email from B6 and noticed one thing in it that actually makes a lot of sense:
Pet carrier bag tag - a bag tag will be attached to your pet carrier at check in to let everyone know your pet is ready to jet.
They are putting in place a program that will allow a GA to know that the pet fee has been paid and to easily deal with it if the fee hasn't been paid. Makes a lot of sense, especially considering how expensive the fee is.