It happened in one day... She was fine day before, and next day I noticed the good chunk of the hind hoof just disappeared. Like it was cut off with the knife. And another piece was splitting too. So I ended up rasping that split away and smoothing (rounding the hoof) on my best (thank God I have farrier tools!). She doesn't look like having big discomfort, however my concern is the hoof side is missing almost up to the sole (went through white line).
So my question is: should I do something about it? Any protection to use? Anything to put on to grow it back faster? I'm using the pine tar (which suppose to give faster growth). Tried to find venice turpentine, but couldn't find it out around.