Yeah this is something I've been thinking about for a while actually. There's a cluster of sightings in the midwest US that keep popping up along old decommissioned rail corridors and I don't think its coincidence.
My theory - and take this with whatever you want - is that the rail lines created these long undisturbed corridors through landscape that basically function as wildlife highways. Whatever dogman is, if it exists, it'd make sense it uses the same routes.
From a remote viewing angle I've done a couple sessions loosely targeting dogman reports and the environmental "feel" I keep getting is heavily wooded, linear, like a long narrow strip of something. Could be nothing but it fits.
Anyone got UK equivalents? Old trackbeds here are usually just cycle paths now but some of the more remote ones in the north might be worth looking at. Would be curious if theres any British sightings that match this pattern.