That first track looks like a small bobcat,The third one is a skunk The middle one is odd. It is not a red fox because the rear pad is to wide and deep.It almost looks like a fox track that a bobcat stepped into.cats walk track for track in their own trails. what looks like a single cat track could actually have been run many times. once you figure this out you will trap many cats simply by setting that track.Problem with the idea that a cat stepped track for track with a fox is that cat has a heavy stagger to its stride.I would guess its a large grey fox as that is what it most resembles.Ive got 49 years trapping experience and 28 years as a full time Taxidermist.If I see a track in person its usually easy but occasionally its a puzzle.