Bob has only ever had a couple of sets of shoes in his life, and has been barefoot for 3.5yrs. He has feet like iron, only needs trimming 3 times a year and self trims relatively evenly (last time we had our tri-annual trim I only got charged half as all she needed to do was even up a little).
He crunches over anything and everything usually, but the last 3-4 months he has been a bit footy on the rocks and gravel

. Paths we usually canter up he now is reluctant to trot on. Trimmer said his feet were all good when she came recently. He has been on starvation all summer, as usual, and didn't get fat at any point - in fact he stayed consistently slimmer this year than he ever has. He has never been unsound. The other day when I was riding him he trod on a stone trotting and actually went lame for a few strides so it obviously hurt him.
He has mild thrush but that has always come and gone and never caused big issues before.
In general he is being really laid back and nice recently so I don't know if it's just that he is feeling all soft and squishy recently, as opposed to giddy joggy pony like he was last year

.
Anything I should be feeding or doing to improve this? It has been really wet this year so I don't know if that has had an effect, but I am quite surprised as his feet are usually perfect and even on the hard frozen ground he usually doesn't bat an eyelid.
xxx