Arthritis is a condition where the cartilage of a joint has started to wear away and the fluid that lubricates the joint becomes thin, thus no longer able to truly lubricate the joint. Arthritis can occur quickly in instances after an injury. Arthritis can also come on slowly - your horse gets gradually more stiff, much like we do. Regardless of the cause of the arthritis, this is not a welcome problem for any horse owner. Depending on the severity of the arthritis, there are many options available to owners. The main goal managing arthritis is to decrease inflammation in an effort to stop further damage to the joint. This can be done with light work, supplements, and injections.