Remembering you fox pictures I thought it would be them. But I see you say they are dog tracks. Must be why the tracks tend to visit trees. You know by now I like these snow pics - a great one.
Mary MacADNski: I have resident crows. As soon as I feed them, the neighbours dog who lives further than you can see, seems to smell the crow's food and comes to see what is out there to steal. They come by once or twice a day. They're both girls so they don't pee on trees but there is always less snow around trees and the dogs know that so head toward them.
I like this, Mary.