Mine takes headlong dives into the grass and then vigorously, even acrobatically rolls multiple times during every single walk. I’m sure it’s not scent rolling, because she does it in so many different places and so frequently and without sniffing around or anything prior. Once she starts, she will usually dive more than once and not on a specific spot in the grass. She dives so that side of snout hits first and then progresses into a full body roll. She rarely does it in our own yard, which I’d think she’d do if it were because her skin itches. Sometimes it feels like she does it when we’re turning back home and she wants to keep walking, as if trying to get the harness off. But she will have done it randomly already before then, as well. Just joie de vivre?