10-13-2010, 03:57 AM
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I am guessing it is probably just exfoliating sole, that perhaps due to weather, incorrect trimming, lack of exercise, for eg, has been retained & now coming off in chunks.
This sort of thing could be also 'false sole' from massive subsolar abscessing, which has burst a while ago, new sole has since grown & now the old is sloughing away. But this extent of solar bruising/abscessing usually goes with founder, which I hope you'd be aware of if happening & it is also very unlikely that both horses & all feet would suffer this at the same time anyway.
Given that you also mention cracking & chips lately, I would be considering their diet & nutrition and how often & how well they're trimmed. Perhaps your farrier's no good, or not trimming often enough(what's the schedule?). Perhaps their diet is causing lami to weaken their hooves or nutrition is deficient or imbalanced... Pics showing a variety of angles and more info re management & feeding would help if you'd like more specific info.