In your top picture, it looks like there might be evidence of a claw--mountain lion tracks don't show claws. But it's hard to rule out mountain lion given the quality of your pictures. The tracks are about as wide as long (which would suggest cat), and there aren't obvious claw marks. Also, it looks like the animal was directly registering (i.e. the front left foot stepped almost exactly where the front right one did), which is also something that cats usually do and dogs/wolves don't.
Got any better pictures?