Grade 1
Difficult to observe; not consistently apparent regardless of circumstances.
Grade 2
Difficult to observe at a walk or in trotting a straight line; consistently apparent under certain circumstances.
Grade 3
Consistently observable at a trot under all circumstances.
Grade 4
Obvious lameness; marked nodding, hitching, or short stride.
Grade 5
Minimal weight bearing in motion and/or at rest; inability to move.
Economic Impact: *2005* study is here. I have not read it all yet.
1998 United States Department of Agriculture Study by the National Animal Health Monitoring System:
