Warmer temperatures, melting snow, and spring rain create real headaches for horse owners. This post covers what to watch for, and how to protect a horse through the muddiest stretch of the year.

“Horses evolved on prairies; their feet are healthiest when kept away from wet conditions. Nature designed them for a dry climate, just like she designed them to be moving and grazing all day.” — Julie Bullock, DVM, Equine Practitioner and Farrier, Mt. Sidney, VA

Spring Moisture and Its Challenges for Horses

Spring is a natural transition from winter into green pastures, but it brings its own risks. When hooves stay continuously moist, muddy, or waterlogged, horses become vulnerable to a handful of common conditions: scratches, rain rot, and thrush. Here’s a closer look at each.

Scratches

Also known as: pastern dermatitis, dew poisoning, grease heel

Horse with scratches, or pastern dermatitis, on the lower leg

Scratches (Pastern Dermatitis) in Horses

Courtesy: Western Horse Review

Caused by:

  • Moist, dirty stalls or muddy paddocks and pastures
  • Exposure to wet, scratchy grass causing local irritation
  • Bacteria — the same organism behind rain rot
  • Chronic skin inflammation
  • External parasites such as mites

Symptoms:

  • Painful inflammation and lesions around the pasterns, sometimes covering the entire lower leg
  • Scaly, crusty, scabby skin with swelling and redness
  • Hair matting
  • Lameness
  • Horses with white legs and heavier breeds, like draft horses, may be more susceptible
  • Not typically contagious

Treatment:

Severe cases may need antibiotic treatment from a veterinarian. For mild-to-moderate cases, a simple zinc and castor oil cream is a natural option, and EquiSearch outlines additional treatment and prevention approaches worth reviewing. If tea tree oil hasn’t been used on a horse before, a 24-hour spot test first is a good precaution.

Rain Rot

Also known as: rain scald, mud fever

Horse coat showing signs of rain rot, or rain scald

Rain Rot in Horses

Courtesy: Horse Answers Today

Caused by:

  • Bacterial spores
  • Heavy rainfall, high humidity, and warm temperatures

Symptoms:

  • Crusty scabs that peel off in clumps of hair
  • Bare patches on the skin
  • Itchiness
  • Small, pus-filled bumps called pustules
  • Scabby tufts known as “paintbrush lesions”
  • Highly contagious to other horses, animals, and humans
  • Sometimes mistaken for ringworm, a fungal disease

Treatment:

Left untreated, rain rot can lead to secondary infections. Tack, equipment, and grooming tools should never be shared with an infected horse, and infected animals should be separated to prevent spreading. Only breathable rain sheets or blankets should be used. Scraping off excess water after bathing (the WaterWisk makes this quick and easy!) and drying the horse completely both help prevent it from taking hold.

Thrush

Diagram of horse hoof anatomy showing the frog and heel

Equine Hoof Anatomy Diagram

Courtesy: Merck Veterinary Manual

Caused by:

  • Wet, muddy conditions and unsanitary stalls
  • A degenerative infection from packed mud in the hoof, specifically in the grooves of the frog and hoof cracks
  • Heavy rainfall, high humidity, and warm temperatures

Symptoms:

According to the Merck Veterinary Manual, thrush presents as a painful infection with visible dark, gooey discharge and a foul smell, often compared to rotting cheese. A change in hoof color is common, and horses with high-set, deep heels tend to be more susceptible.

Treatment:

Moving the horse to a clean, dry environment encourages healing. Economical Equestrian covers 10 treatment options, including apple cider vinegar.

Prevention:

Daily, gentle hoof picking before and after riding, along with a daily swab of a gentle preventative powder, goes a long way toward keeping thrush from developing in the first place.

This information is not a substitute for professional veterinary advice. A regular vet or farrier is the right resource for treatment decisions specific to a horse’s health history and condition.

Consistent Grooming Matters Year-Round

A regular grooming routine helps catch skin and hoof issues early, when they’re easiest to treat. The EquiGroomer makes that routine easier, faster, and more comfortable for both horse and owner.