He has said that they will/may be lame until they build more sole. He left a couple, this gelding in particular, a little long last trim because hes been SO sore.
If a horse is 'low grade' or 'sub clinical laminitic' for eg, they may well be a bit tender immediately following a trim, through no fault of the farriery. Even so, I would not just accept this and (even if other probs persist in causing the 'SCL') you can avoid or at least minimise this by adjusting the trim, &/or trimming less, more frequently - IMO it is generally only an issue for horses left to overgrow between trims, while if they're *maintained* with a rasp frequently enough, they don't have the issue.
But it sounds like, regardless of whether they are 'SCL', this is more than just a little tenderness immediately post trim anyway. So I'd definitely be looking for better answers and while it's still possibly not his fault(not enough info still IMO), I'd personally be putting his visits on hold until you get to the bottom of it.
Padding your horse's feet - even with baby diapers or foam duct taped on if you're desperate - if/when they become lame or they need to be on hard ground, should alleviate the discomfort & prevent further damage from thin soles. If their soles are that thin, they're at risk of serious bruising & abscessing if not protected.
I meant 'what have you done' specifically about the horses being lame after trimming? I hear you, that you've been trying everything & frustrated otherwise. Especially the 'out of next guys' sentiment. Unfortunately yours is not an uncommon experience... I also don't think I was clear regarding the rasping the wall surface... Generally I believe it is not necessary or desirable to do this. But not knowing exactly what/how she did or why, or what state the feet were in, I just wouldn't be saying it was necessarily wrong. And while I do not believe doing this will cause
cracks of itself, the outer layer of hoof which grows down from the coronary border is harder, impermeable(if not compromised) and the softer inner wall material is indeed more easily invaded by infection if the outer layer is compromised/cracked... removed.
[B]He likes to trim every 8+ weeks. He said that trimming to often weakens the hoof wall.
You can often get away with
trimming horses that infrequently, without issue, particularly if they're already healthy & getting lots of barefoot exercise, to wear the excess away. But when hoof walls are allowed to become overgrown between trims, THAT is what weakens walls the most, as they distort, flare, separate, crack under pressure... Because they're not built to be a major support structure. At the end of the day, they're just toenails.
And it's also been shown (I think Pete Ramey had a good article on it) that thin soles will not *begin* to grow better, thicker, until the walls have grown out healthily, without 'stretching' or other undue pressure to the laminae. It's also vital, IME, that if you want to effect changes, particularly to run forward heels & such, trimming little & often(say 3-4 weekly) to gradually, continually improve the situation, whereas leaving hooves to overgrow between trims often sets you back to 'square 1' each time. You may still be able to prevent the prob getting worse, but it's difficult/impossible to improve things on each trim.
This explains why the cracks, though opened up have gotten much worse? This farrier had me using coconut regularly on all of our horses bc he said the feet are dry (we have sandy soil).
If they're not being treated effectively, and they've also been sealed up, yes, that's a problem. Horses evolved in semi arid environs - their feet are meant to be dry on the outside! And remember, if the outer wall is not compromised, it is impermeable anyway, so oil, water, whatever, will only sit on the surface, it doesn't sink in, or help the moist inner wall stay moist.
Yeah, lots of people have a range of different ideas, opinions, knowledge... and if you just try everything without analysing it, I think the law of averages is likely to show that you'll end up trying a lot of rubbish, along with the helpful stuff. And as farriers are just people, and in many places it's not even a regulated profession, so there's not even a guaranteed 'base knowledge', how are you to know who's worth listening to? So I think it's vital for owners to educate themselves as well as possible about hooves, lameness, etc. To that end, the thread link in my signature line is one place to start.
I've used thrush buster, tea tree oil, one farrier said hydrogen peroxide, another bleach (I skipped that), another alcohol, another lightning something I forgot its name, another suggested something else that I've forgotten the name of but they needed to soak with it in a boot for 45 minutes and it was quite pricey, but also did not work to cure the cracks on this horse or any of the others.
There are all manner of topical treatments that can be effective to kill 'seedy' bugs. They can be bacterial, fungal or protozoa, so a 'broad spectrum' antiseptic, and one that isn't deactivated with air, dirt, moisture(because you tend to find those on hooves!) is best. Generally, so long as infection isn't into live tissue, 'heavier' chems are fine. But IME topical treatment alone only tends to work with shallow infections, in more 'ideal' environs. Generally it takes a 'joint approach', because otherwise, you can't get deep enough to treat it all, &/or mechanics or such are perpetuating cracks, so the seedy just reinfects.