Just recently Brandon, my 19 year old arab, has started to cross step in front at the walk and trot.
I asked my farrier about and he said he was 'lazy and not paying attention'...but honestly I have had him working pretty well lately. It is even ascending and descending hills, etc, on the trail, not just plodding around.
He is shod and padded in front. I have no idea what is causing this...very weird.