Rolling on their backs can signal submission and trust, showing that dogs feel comfortable and safe in their environment.
Rolling on backs can be a playful invitation for interaction with other dogs or humans, inviting belly rubs and fun playtime.
Dogs may roll on their backs to expose their belly and throat as a way of communicating non-threatening intentions.
Rolling on a surface can also be a form of scent marking, leaving their scent to claim the territory as their own.
Rolling on backs can be a way for dogs to stretch their muscles and enjoy a moment of relaxation.
Dogs might roll on their backs to cool down, as the cooler ground offers relief during hot weather.
Some dogs roll on their backs to get attention from their owners or to initiate play.