Judging by all the rocks, it looks to be relatively hard ground. If so, id bet its neither.
Honestly looks way to old to tell much. I'd say as much as months ago. Hard to tell without having eyes on though.
Cats walk around with their claws detracted. Dogs will have their nail marks present.
Big cats have a decent stride to them, more so than yotes, and bob cats stride is not a whole lot bigger than a house cat.
Cats pads will disperse their weight a lot as well, making it hard to see their track.

WB