Various forms of limb contact :

    1. Brushing:  light striking, especially as in forging or interfering

    2. Cross-firing:  contact on the inside of the diagonal fore- and hind feet; common with pacers

    3. Elbow hitting:  horse hits elbow with the shoe of the same limb; fairly rare

    4. Forging:  toe of the hind foot hits the sole of the forefoot on the same side

    5. Knee hitting:  case of high interference; generally seen in Standardbreds

    6. Interfering: striking, in either fore or hind limbs, anywhere between the coronary band and the cannon by the opposite foot

    7. Overreaching: toe of the hind foot catches the forefoot on the same side, usually on the heel; the hind foot advances more quickly than in forging

    8. Scalping: toe of the front foot hits the hairline at the coronary band or above on the hind foot of the same side