Following the Multi-Dog Conference, I think a lot of us are eager and ready to begin teaching our dogs how to wait their turns while we train our other dogs! It's such a useful skill for any dog to have, especially in a multi-dog household.
And as much as I support teaching the skill, one thing that I have seen often is that while a handler has good intentions and is rewarding the waiting dog for being patient, they are also simultaneously disengaging from their working dog. And though that may not lead to a big response, I do notice a change in the working dog's behavior whether it's signs of stress, disengagement, or decreased motivation.
So I ask you—have you ever checked with yourself, "how does my working dog feel when I'm also reinforcing or managing my other dog for waiting?"