Why is my horse losing hair on the back of its pasterns? | arlo.® Atlas
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Overview
Hair loss on the back of the pasterns is often linked to mallenders or sallenders, but it can also happen with rubbing, mud, skin irritation or a small area of dermatitis. It’s a sign to look closely at the skin rather than assume it’s just a cosmetic change.
In many horses, the cause is related to the skin getting irritated, dirty or repeatedly damp, but there can be more than one factor involved.
Things To Check
1. Check whether the hair loss is only on the back of the pasterns or whether there are similar patches elsewhere on the legs.
2. Look closely for scabs, crusting, redness, thickened skin, broken hair, swelling or any signs of soreness.
3. Notice if it seems worse after turnout in wet ground, muddy conditions, clipping, grooming or leg washing.
4. Check whether boots, bandages, brushing, tack or stable surfaces could be rubbing the area.
5. Feel for heat or tenderness, and watch whether your horse is bothered when you touch the area.
6. Look for mud, grease, dried dirt or dampness that keeps the skin from drying properly.
7. Note whether your horse is also stamping, rubbing, itching or showing signs of irritation elsewhere.
8. Think about how long it has been going on and whether it’s changing, spreading or coming back after it improves.
Common Causes
Mallenders and sallenders are one common cause, especially when there is dry, scurfy, crusted or thickened skin on the backs of the legs.
Rubbing from boots, bandages, mud, dirt or repeated washing can also lead to hair loss in this area.
Skin irritation or dermatitis may cause the hair to thin or fall out, sometimes with mild redness or scabbing.
Less commonly, infection, parasite irritation or another skin condition may be involved, especially if the area is sore, weepy or spreading.
What To Do
Keep the area clean and dry, but avoid harsh scrubbing or repeated washing if the skin is already irritated.
Remove any possible sources of rubbing and check fit carefully if you use boots or bandages.
Monitor the area over a few days so you can see whether it’s improving, staying the same or getting worse.
If the skin is muddy or dirty, gentle hygiene and careful drying are usually more helpful than aggressive cleaning.
If the problem keeps returning, is uncomfortable, or starts to spread, it’s sensible to ask your vet for advice so the cause can be properly identified.
Products That May Help
If the skin around the pasterns is getting dirty, damp or caked with mud, a good leg-care routine can help support day-to-day hygiene and make it easier to keep an eye on changes.
Related Questions
Is mallenders the same as mud fever?
Can rubbing boots cause hair loss on the pasterns?
When should I ask my vet about pastern hair loss?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.