You need to take her to the vet, she probably has laminitis(founder).
My neighbors APH roping mare had this. First she went lame, then heat, then she refused to walk on it. The next day she was down and her hoof had basically looked like it all came out through the sole. It looked like it, exploded. The mare had inflammation in her hooves, and there was no where for all of it to go, so it squished out the bottom. She's okay now, but he sold her a few months ago.
| Diagnosis |
Early diagnosis is essential to effective treatment. However, early outward signs may be fairly non-specific. Careful physical examination typically is diagnostic, but radiographs are also very useful.
.Increased temperature of the wall, sole and/or coronary band of the foot.
.A pounding pulse in the digital palmar artery. (The pulse is very faint or undetectable in a cold horse, readily evident after hard exercise.)
.Increased vital signs and body temperature
.Walking very tenderly, as if walking on egg shells
.Repeated "easing" of affected feet
.The horse standing in a "founder stance" (the horse will attempt to decrease the load on the affected feet). If it has laminitis in the front hooves, it will bring its hindlegs underneath its body and put its forelegs out in front called "pointing"
.Tendency to lie down, whenever possible or, if extreme, to remain lying down.