Any decrease in an animal's ability to bear weight on a limb or a loss in the normal mobility and function of a limb can be considered lameness. Lameness can be extremely subtle or profound, affecting one limb or several limbs. It can be intermittent or constant, worse in the morning, worse at night, worse after rest, worse after or during exercise. There is no breed, age or sex predilection for lameness. Lameness may be associated with a traumatic event, such as being hit by a car, or it may develop gradually, as in a bone tumor in an affected leg. The underlying cause of a lameness may be life threatening or it may be detrimental to a good quality of life such as debilitating and painful hip dysplasia.
For more information, please read Lameness