Standing wraps apply pressure to the horse's lower limb, which can help keep fluids circulating smoothly. | Photo: Erica Larson/The Horse

Q. Recently, we have been experiencing some very hot weather, and I noticed that my horse’s legs are stocking up. This has not happened before. Could this be related to the heat, and is there anything I can do nutritionally that might help?

A. “Stocking up” is swelling in the lower limbs caused by pooling of lymph, a fluid containing infection-fighting white blood cells that circulates through the lymphatic system. Stocking up is typically temporary and often occurs due to reduced activity, which impairs circulation. It is commonly seen in horses that live outside that are brought in for a time and, therefore, do not move as much as normal. Sometimes, though, it develops in other scenarios.

Step One: Check for Injury or Illness

Any time limbs swell, it’s important to check for heat and pain to determine whether the cause might be an injury. Also, take your horse’s temperature; if it’s elevated, he could have an