It does sound to me like a male, as I call it, ‘on patrol’. Sometimes wonder where they get the energy from! The other night I was taking the bowls in when up dashed this hog, stopped at my feet and then continued on his way. Only to come back when I had crouched down to pick up the bowls and almost sniffed at my hand, before dashing off again.
The patrolling seems to serve a double purpose of looking out for any females to court or any males to biff! The sniffing, possibly likewise, but hogs do rely a lot on their sense of smell. Their eyesight isn’t that good at the best of times and it is dark. They look very endearing with their little snouts up in the air sniffing, don’t they?
Even if the resident hog isn’t female, if there are hogs around, it is likely there will be female visitors.