Scent marking: Rolling in the grass can be a way for dogs to leave their scent on the grass, which serves as a form of communication and territorial marking.
Cooling down: Dogs may roll in the grass as a way to cool down. The cooler ground temperature and the contact with the grass can provide relief from heat, especially on hot days.
Itchy or irritated skin: Dogs may roll in the grass to alleviate itching or irritation on their skin. The texture of the grass can provide temporary relief and help to scratch an itch.
Enjoyment and play: Rolling in the grass can simply be a fun and enjoyable activity for dogs. It allows them to engage in natural behaviors and experience different textures and sensations.
Social bonding: Rolling in the grass can also be a social behavior. Dogs may roll in the grass together during play or to establish and reinforce social bonds within a group.