Can any of the above proposed group healing requests specify the inclusion of all companion animals belonging to the people involved? Will the animals receive comparable benefits compared to being part of an all-animal session with that specific Lightworker Healing Protocol session?

This indeed will happen because the extra touches for the Animal Protocol per se, will be more than compensated for in launching a Protocol request to have healing done again and again in perpetuity for the animal. So that will accomplish all that may be needed, especially over time through the repetition.