the
leg will have an injury not heal correctly, the
dog will not be able to jump properly and sometimes leg will give and not hurts old injury or gets new injury, common sense, and as time goes, arthritis sets in and its an injury will calcium deposit and tissue scars, that like us, weather, move the wrong way, we hurt all over again, so ongoing pain and stress on injures, dogs do not always let you know the pain, cause dogs will dogs until the end, until its really bad and they limp or cry, pa