hoping for advice on treatment and shoeing for this mare. brief history: purchased 6yr old tb mare in march 2011 was told by prior owner she was in an xc accident, and cracked RF hoof at coronet, to toe. installed metal plate for support, and was off work and lame for 3 months and had recently come pasture sound. crack was approx 1/2cm wide and through hoof wall, but no sign of bacteria/fungus, so present owner/farrier filled with epoxy to keep sealed (as i recall was the main purpose), and to add strength. crack grew out with less depth and became tighter over the next year, plate and epoxy removed after 6 months approx, and horse has been sound for 3yrs since, although crack is always present. recently (spring 2014) crack appeared to deepen, and at farrier visit upon opening found extensive wld, and also in both heels. mare was track trained, but never started. bought as 3/4yr old by eventing trainer, who started, trained, and competed in jumpers and xc to pt, until accident. mare also had severe wither sores and pressure sores which resolved promptly with properly fitted tack and blankets, and massage/chiro. since purchase as 6yr old, has been lightly ridden on soft footing (hogfuel/sand/pasture) to avoid concussion (has had the past winter off). high strung but well behaved, and no significant health issues. shod fronts, and trimmed every 6-7 weeks by same farrier. has lived in same mgmt of in/out stall to pasture, but moved to a different farm w/same setup 1yr ago. only kept inside for short periods (4-6hrs) daily, but mare chooses to spend most of her time inside. pasture in lower mainland is wet throughout winter/spring. 2 horses on 5 acres rotated in 2-3 sections. approx 7 weeks ago pulled shoe on LF, repeated 2x in following 4 weeks. shoes appear to be pulled at inside, either from overreaching or stepping on LF with RF, in sand paddock area. bell boots put on approx 3 weeks ago. this week at farrier visit which was 1 week overdue, found excessive wld in both heels, and front crack after opening area as it crack looked deeper than in past. farrier re-installed metal plate and cleaned up most of the necrotic tissue and recommended second opinion as he'd not had experience with this issue. aware that heel is underrun, and likely has been for some time, which i missed and understand it may contribute to problem. have been told by farriers and vets crack will always stay, but hoping to get her back to where it is tight w/no disease. waiting for vet to come tomorrow to x-ray and assess. TIMELINE: jan 2011 - injury to coronet resulting in crack and lameness, metal plate installed march 2011 - horse sound and put slowly to light work - crack filled, no evidence of diseased tissue winter 2011 - plate and acrylic removed, foot stayed stable and horse stayed sound may 2014 - pulled LF shoe 3 times, bell boots put on horse june 2014 - found excessive wld in both heels and crack of RF have added pics taken yesterday of all 4 feet (apologize they aren't the best shots). can add others if needed, and appreciate any advice i can use to help us with the mare. http://s135.photobucket.com/user/bunnytron/library/bailey thank you.