Thanks for responding, guys. Here in east central Saskatchewan, deer mice, shrews and meadow voles are all active during winter. In the 14 years we have lived here, I have never seen any of them running on top of the snow. But deer mice are active mostly from dusk to dawn. Or so I just read. They also commonly leave tail drag marks. Or so I just read yesterday. Shrews commonly leave tail drag marks, but generally move seemingly randomly, and not in a strict linear direction. Or so I read yesterday. Meadow voles are very common on our property, and our dog loves to hunt them In their tunnels beneath the snow. Above the snow they move linearly, and don’t leave tail drag marks. Or so I read yesterday. The image I provided above seems to not have tail drag marks in three of the sets of tracks. Yesterday I sent the image to a trapper, from whom we bought this property in 2008. Based on the tracks generally having no trail drag marks, he thought meadow vole. But not definitively so.
I would welcome more thoughts and input.