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O

 
      oblique (fracture): fracture at an angle to the shaft of the bone.
     
      OCD (osteochondritis desicans) lesion: a cartilaginous or bony lesion that
      is the result of a failure in development.
     
      off side: right side of horse.
     
      oiled (oiling): administering mineral oil via nasogastric tube to help
      relieve gas or pass blockage. Preventive procedure commonly used in long
      van rides to prevent impaction colics. See colic.
     
      on the bit: refers to carriage of the horse in which the neck and back are
      rounded, the hind legs are well engaged and the horse is obedient to the
      action of the bit. Also known as "in the bridle".
     
     on the muscle: denotes a fit horse.
     
     open fracture: see compound fracture.
     
     osselets: see arthritis.
    
     osteoarthritis: a severe form of arthritis that has a progressive 
     degeneration of joint cartilage. Occurs most frequently in the joints 
     below the radius in the foreleg and the femur in the hind leg. Some of the 
     more common causes include repeated trauma, conformation faults, blood 
     disease, traumatic joint injury, subchondral bone defects (OCD) lesions 
     and repeated intra-articular corticosteroid injections. A permanent form 
     of arthritis with progressive loss of the articular cartilage in a joint. 
     See degenerative joint disease.
     
      over at the knee: type of conformation in which the front leg looks like
      it has a forward arc with the center at the knee when viewed from the
      slide.
     
      overcheck: a strap that holds the bit up in the horse’s mouth.
     
      overgirth: an elasticated strap that goes completely around a horse over
      the saddle, to keep the saddle from slipping.
     
      over-reaching: toe of hind shoe striking the forefoot or foreleg.