That's a great set of prints and a great photograph, Bob.
I find that folks are more apt to confuse dog prints for ML prints, than the other way 'round, however...
Probably worth mentioning that adult lion prints are typically 3-3/4" to 4" wide, since this particular lion of Bob's didn't happen to drop any dollar bills along it's trail
One trait that can make cat ID somewhat harder at certain times like in the summer/fall dust here, is that cats (and I'm thinking of bobcats, particularly) tend to direct register when stalking, so they often to squash and blur out the heel pads. Too, deep lion prints in mud fill up and tend to weather quickly in the softer, lower spots during the wet season. So, lots of times, you won't have much of a heel pad to go by.
Yellowhammer's post, and especially that drawing, illustrates something that's very useful to know when the track is less distinct than in Bob's picture: the splay of the toes. Cat tracks have toes arrayed in more of a radius. The total print also has a more rounded shape.
Hope you'll all excuse me for being obvious, but if claws are plainly visible in the print, it's almost certainly a dog. I'd go so far as to say that any toenails showing in all but the very slickest of conditons are likely to be made by a canine, and not a ML. Personally, I've only ever seen a lion's retractable claws show up for extra gription--as needed, now and then--in tracks laid down in wet slush.
LionHo