Tina and her elderly dog, MeeMoo, visit "Rainbow Bridge Enterprises," a mysterious clinic offering human-to-pet communication. The esoteric Dr. Bailey Picadello and her burnout partner, Herb, detect a cosmically strong bond between their new patients, triggering a journey across time and space where Tina and MeeMoo can properly say goodbye in their final, fantastical forms. Chaos ensues as Tina is abruptly thrust back to reality while MeeMoo is left behind in the transcendental Rainbow Realm. Tina may feel a bittersweet sense of relief, but Dr. Bailey gets more than she bargained for when the fabric of reality might have just split wide open.