DALZELL, S.C. (AP) — On a recent cool morning north of Dalzell, Jackpot, a 13-year-old quarter horse, was eagerly grazing on some fresh green grass as Dr. Sarah Blackwell prepared to do some dental work on the chestnut gelding.

Blackwell went over the horse, checking his coat and listening to his heartbeat with a stethoscope before administering a sedative so she could "float" the horse.

For city slickers who don't know, "floating" a horse means grinding down sharp points and extra growth on the horse's teeth. Even for horses whose teeth match up well top and bottom, the teeth must be occasion...