I have a buyer who purchased a pair of sport boots

(To protect a horses legs when running barrels, speed events, etc), just opened up a case stating the item was defective. They purchased this item 3 weeks ago and used it on their horse multiple times and they are stating defective item as the boots got torn/damaged by the horse. THe entire point of the boots is to protect the legs of the horse while doing faster events, which the boots did protect the legs, but have damange now due to the horse clipping the boots in use. So, they opened a case as not as described. I am wondering if I even have a fighting chance at this one considering the boots were used mutliple times and horses can damange nearly anything and the point of the boots is to protect the legs of the horse and they did that, but in the meantime, the horse wrecked them when in use.