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      "grab a quarter": injury to the back of the hoof or foot caused when the
      hind hoof steps on the front hoof. Also known as "overreaching."
       
      gait: the characteristic footfall pattern of a horse in motion. Four
      natural gaits are performed by all horses: walk, trot, canter and gallop.
      Some horses also perform other gaits, such as the pace, running walk,
      rack, etc.
     
      gastric ulcer: ulceration of a horse’s stomach. Often causes symptoms of
      abdominal distress (colic)
     
      gelding: a male horse of any age that has been neutered by having both
      testicles removed ("gelded").
      
      get: progeny of sire.
     
      girth: an elastic and/or leather band, sometimes covered with sheepskin,
      that passes under a horse’s belly and is connected to both sides of the
      saddle.
     
      granddam: see second dam.
     
      grandsire: the grandfather of a horse; father (sire) of the horse’s dam or
      sire.
     
      gravel: infection of the hoof resulting from a crack in the white line
      (the border between the insensitive and sensitive laminae). An abscess
      usually forms in the sensitive structures, and may eventually break at the
      coronet as a result of the infection.
     
      gray: a horse color where the majority of the coat is a mixture of black
      and white hairs. The mane, tail and legs may be either black or gray
      unless white markings are present.
     
      greasy heel, grease heel: a severe, deep skin infection on the backs of
      the horse's pasterns. The bubbly-looking skin growth creates deep crevices
      for the infective organism to escape topical treatments. This condition
      usually involves two or more feet, most often the hind feet. Successful
      treatment typically requires aggressive debridement, with twice daily
      cleansing and disinfection of remaining tissues. The horse should be
      housed in an area that's dry and clean. Systemic antibiotics may be
      warranted if the specific infective bacteria are identified via culture.
     
      green osselet: in young horses, a swelling in the fetlock joint,
      particularly on the front of the joint where the cannon and long pastern
      bones meet. This swelling is a result of inflammation and reactive changes
      of the front edges of these two bones. If the green osselet does not heal,
      a "chronic osselet" might develop with a permanent build-up of synovial
      fluid in the joint and inflammation and thickening of the joint capsule
      over the damaged area, with secondary bone changes following the initial
      inflammation.
     
      groom: a person who cares for a horse in a stable.
     
      growth plates: located near the end of long bones where they grow in
      length. See physis.
     
      grullo: body color in American Quarter horses smoky or mouse-colored (not
      a mixture of black and white hairs, but each hair mouse colored); mane and
      tail black; usually has black dorsal stripe and black on lower legs.
     
      guttural pouch: an air-filled pouch in the throat region that may become
      infected. The pouch is part of the Eustachian tube, a passage between the
      pharynx and the middle ear, and is unique to the horse.