06/12/2026
Cleaning the Ge***al Tract of Horses
Brian S. Burks, DVM
Diplomate of the American Board of Veterinary Practitioners®
394 Fox Road
Apollo, PA 15613
(724) 727-3481
www.foxrunequine.com
All male horses should have their sheaths (prepuce) cleaned at least twice per year. All the debris that builds up in the prepuce can potentially cause transformation of epithelial cells to squamous cell carcinoma; sunlight is thought to cause many skin cancers, but obviously the sheath does not get a lot of sun up inside, and so sm**ma is thought to lead to cancer in some chronically dirty male horses. Oh, and, cleaning the p***s is not cleaning the sheath! There is lots of skin folded up inside that must be cleaned, requiring your entire hand, wrist, and part of your arm will fit up inside the sheath, while the p***s is pulled gently outside of the prepuce.
Sheath cleaning is done with sedation, unless you have a very cooperative horse that will drop the p***s out of the prepuce and allow thorough cleansing. Unless this happens, the structures cannot be adequately cleaned or checked. Most male horses do not like being checked for a ‘bean’ in the urethral fossa. Cleaning with water, KY jelly, Dawn dish soap, and other disinfectants are usually adequate. We use chlorhexidine scrub to break up the debris.
Chlorhexidine also has some residual activity against bacteria. There is, however, a normal microbial population which should not be too disrupted for fear of leading to fungal infection in the prepuce.
The p***s and prepuce should be checked for masses such as squamous cell carcinoma and melanoma. At the same time, stallions should have the sc***um palpated; there should be two testicles of same size, shape and consistency. Abscesses are soft, painful swellings; hematomas are soft, non-painful swellings. Also look for tumors, infections, or hernias.
The same can be said for mares and fillies: check the v***a for discharge and masses. Check the udder for mastitis, especially in mares currently nursing foals. The udder should also be checked for masses and should be cleaned at least monthly. The debris that collects between the two sides of the udder (mammary glands) may at the least be uncomfortable and at the worst can also develop skin cancer in this region. Most mares can be taught to stand quietly while being cleaned. A few may require sedation, especially if they have not been cleaned for long periods of time.
So, as with teeth, it is better to have a veterinarian clean the p***s and prepuce, as that person has medical knowledge regarding preputial/penile neoplasms and other diseases like habronemiasis. The veterinarian can the prescribe the appropriate treatment. I do have certified veterinary technicians clean, but anything out of the normal is brought to my attention or I am examining the area myself. In light of the current situation with screw worms, it is best to have a proper professional examination.
Fox Run Equine Center
www.foxrunequine.com
(724) 727-3481