Hmm, Mudpie's mild mystery lameness persisted for a week before I took him to the vet and discovered that he'd torn his suspensory ligament. It may be worth it to get a vet's opinion. :)
I'm certainly not suggesting that it's something that serious, but he was only off every couple of steps, and it was hardly visible. I gave him a couple days off and he was still slightly lame, and though some people advised that I let him work through it after a bit more time off, I trailered him down and was devastated to learn that it was his suspensory.
If I'd continued to work him, or even turned him out, he could have driven the injury to the point of career ending, which my vet informed me is what a lot of people end up mistakenly doing when they overlook or brush off them mild lameness.
Seven months later and he's still on stall rest just beginning handwalking.
Just something to consider! :)
The hills were bathed in moonlight, the shadows not so stark;
Silver light reflected off his brown hide as he held me in the dark
– I love you, Mudpie!