Recently, this has been Tibby's standard look every night. She goes outside to potty (or so she claims) and comes back looking like this. Then she gets her mouth wiped off, which she hates and an hour or so later she goes back outside to do it again.
I spread 20 bags of mulch around in the yard, in spots where she was digging. She doesn't like to dig in the mulch, but she keeps finding new places to play. I don't really mind, my yard is far from perfect, so it's not like she is damaging anything.
Whatever makes her happy.