I just wanted to pop in real quick about those cracks. First, I don't think being dry all the time is nearly as bad as being wet. And wet/dry, wet/dry is very damaging to the hoof wall. Excess moisture makes the hooves easier to bruise on a rock. Excess dryness? Well, to a point, moisture is controlled on the inside of the hoof by good blood flow, etc. Unless your horse is dehydrated, and/or shod or trimmed to a point that circulation is compromised, excessive dryness is not really a problem, so I actually DO NOT advise muddy water trough areas, at least not intentionally. Sure, horses encounter mud and rain, but the ones that get the cracks tend to be in a cycle of wet/dry, rather than one extreme or the other, and again, water, in itself isn't bad, except it does soften the hoof and that makes it easier to puncture, bruise or get infected.
Personally, I would just treat the hooves with an anti-fungal med (like ACV ) let them dry thoroughly, then apply a hoof SEALANT. It looks like polish, but it prevents the hoof from being water logged, and if you are in a dry area, can lock IN the internal moisture, but as long as the hoof isn't excessively rasped, it tends to hold the moisture level, despite dry weather. Watch hoof trimmings on apparently very dry hooves, after being cut away, the curl up really tight, evidence that there was plenty of moisture inside...
Just be sure to get sealant , not polish,that doesn't wash off, or the first rain will undo it and defeat the purpose. This is good for pastured horses that are in humid areas with a lot of morning dew, that dries out in the day, etc. I would suggest reapplying at least once a week.
Also, only apply about an inch below the hairline down, and you can apply to the sole, but not the frog-it needs to breathe. Let dry a few minutes and you're done.
Of course, if you are battling cracks from poor trimming or deep infections, like WLD, trapping the germs in whith a sealant isn't a good idea, and poor trimming will continue to promote cracks until that is fixed. Sealant only works for moisture issues.