Why are my horse’s feathers thickened and scaly?
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Overview
Thickened, scaly feathers on a horse are often seen with mallenders and sallenders, but there can be a few different reasons for the change in skin and coat. In many cases it’s linked to irritation, moisture, dirt build-up or repeated friction, especially around the back of the knees or hocks.
It’s worth checking the area carefully, because the same look can happen with other skin problems too. You may be able to manage mild cases with good hygiene and by reducing anything that seems to trigger it, but ongoing or worsening changes should be assessed.
Things To Check
1. Check where the thickening is happening, since mallenders is usually seen behind the knees and sallenders behind the hocks.
2. Look for scabs, crusting, redness, broken skin, discharge or a bad smell.
3. Notice whether the feathers are worse after muddy turnout, wet bedding, washing or clipping.
4. Feel the area gently for heat, tenderness or swelling.
5. Check whether the horse is rubbing, stamping, lifting the leg or seeming uncomfortable when the feathers are touched.
6. Think about any recent changes in feed, turnout, grooming routine, rugs or stable conditions.
7. Compare both legs, because symmetrical thickening can suggest a different pattern from a one-sided problem.
8. Note whether the skin is just flaky and dry, or whether it’s becoming sore, cracked or sticky.
Common Causes
The most common cause is irritation of the feathered skin, often made worse by moisture, mud, trapped dirt or repeated rubbing. Some horses are simply prone to this problem and seem to get recurrent thickening in the same areas.
Other possible causes include bacterial or fungal skin infection, mites, insect irritation, contact sensitivity to grooming products or tack, and underlying skin conditions that make the skin more reactive. Less commonly, a more general health issue can affect skin quality, especially if there are changes in weight, coat condition or overall wellbeing.
What To Do
Keep the area as clean and dry as you reasonably can, but avoid over-washing or scrubbing, which can make the skin angrier. If the feathers are muddy, soften and lift dirt gently rather than picking at scabs or forcing crusts off.
Check turnout and stable conditions, because wet ground, damp bedding and dirty lower legs can all keep the skin irritated. Regular grooming can help you spot changes early, and it’s useful to keep a simple note of when the problem seems worse.
If the horse tolerates it, part the feathers so you can monitor the skin underneath. Try to avoid any products that sting or leave the skin feeling dry, and make one change at a time so you can judge what helps.
Related Questions
Is mallenders the same as sallenders?
Can mud and wet turnout make feathers look worse?
How do I clean feathered legs without irritating the skin?
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.