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- OAKUM
- Medicated hemp used for packing.
- OBEL LAMENESS GRADES
- A system of rating degrees of lameness resulting from laminitis developed by Niles Obel circa 1948. Obel Grade I features frequent shifting of weight between the feet, no discernible lameness at the walk, and bilateral lameness at the trot. Obel Grade II horses do not resist having a foreleg lifted, nor are they reluctant to walk, but they do show lameness at the walk. Obel Grade III horses do resist having a foreleg lifted, and are reluctant to walk. Obel Grade IV horses will walk only if forced.
- OCCLUSION
- Blocking of an opening or passage within an animal's body.
- OFF
- The horse's right side. The side of the horse that faces east when the animal is walking north. Opposite of near.
- OFFSET KNEE
- See: Bench Knee.
- ONYCHOMYCOSIS
- Means a fungal disease of the nail or claw. Denotes the decay of the inner hoof wall and the white line as a result of infection by highly adaptable microorganisms. a.k.a: White line disease; Onycholysis.
- OPENED-TOED EGGBAR
- See: Backwards Shoe.
- OSSELETS
- Arthritis of the fetlock joint, characterized by hard swelling.
- OSSIFICATION
- The hardening of soft tissues, such as ligament or cartilage, into bone. This is often a part of the natural aging process.
- OSTEO- or OSTE-
- Greek prefix meaning bone.
- OSTEOLYSIS
- Degeneration of bone.
- OUT OF
- Refers to the horse's maternal parentage. For example: Discovery is out of Ariadne.
- OVER-REACHING
- A fault in gait which causes the toe of a hind hoof to strike the back of the lateral fore leg or the heel of its hoof or horseshoe. Similar, but not identical, to forging.