It looks like the very top of the hoof is growing in at a tighter angle.
I wouldn't worry about surface cracks (they don't look deep in the photo) or chips at the bottom as long as the horse is sound.
OP photos of soles would be helpful. I suspect quarters maybe flared and/or a bit long. As Faracat says, sound is good.






Sorry guys, gonna bump this up with a couple more pics taken tonight.
As previously noted, he's doing approx a mile most days on gravelly ground in terms of being brought in and chucked out, but the large chunk that is missing out of his near fore (white) appeared overnight while he was out in the field.
It doesn't look so superficial anymore... any advice, please? Farrier is booked for around 3 weeks time (on his recommendation - 6 weeks between trims). For record, he's not lame. He's a bit footy on stones still, nothing major though and I'm trying to keep him off harsh surfaces as far as possible. Any recommendations on hoof stuff / supplements / how bad this looks would be appreciated!
It's just poor hoof quality, really. The only way to address it ime is through diet. Until you grow in some healthier horn, you'll continue to get these chips. Grass may be your main culprit, but I'd also suspect zinc deficiency. One of the usual suspects - pro balance/hoof or forage plus would be a good supplement to pick.
As for the chipping, it's nowhere near live laminae so imo it's not going to affect the horse in any way as it is.
This is hoof wall separation syndrome by the look of it. Does he have any Connemara blood? In Connies it's genetic and the advice is to keep the feet in a damp condition.
HWSS is genetic, but the hoof wall can separate like that though diet as well, without the horse necessarily having the syndrome. My friends TB's feet looked just like that - it was dietary in his case, and resolved when she introduced pro balance + (and the new growth reached the floor).
To minimise chipping you can maintain a roll on the outer hoof wall, but mainly it's a waiting game.
I think it's very good news that he was poor and on poor feeding.
I have had two with some level of it and both had been on hay only diets and one was very thin. Both resolved with a diet change.
Meanwhile, I would remove everything which will come off easily and disinfect scrupulously every day with 3% hydrogen peroxide. You can buy a litre of 30% on eBay and water it down . Cheap as chips. Don't splash your jods!

