What causes thrush in a horse with clean-looking hooves? | arlo.® Atlas
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Overview
Thrush can still show up even when a horse's hooves look clean on the outside. It often starts in the frog and central sulcus, where moisture, limited airflow and trapped dirt can create the right conditions for it to develop.
There may be several possible causes, including wet turnout, standing in soiled bedding, a deep frog cleft, or feet that are not getting enough regular cleaning and picking out. A clean-looking hoof does not always mean the deeper grooves are healthy.
Things To Check
1. Check the frog and central sulcus carefully for a black crumbly smell, a narrow deep crack, or soft tissues that look damp.
2. Notice whether the horse is more uncomfortable on one foot, especially when picking out the hoof or on firmer ground.
3. Look at turnout conditions and bedding to see if the horse is spending a lot of time in wet, muddy or dirty areas.
4. Check whether the hoof is being picked out regularly enough, especially after exercise, turnout or muddy conditions.
5. Feel for heat, tenderness or any change in how the horse places the foot.
6. Look for a very deep central sulcus, narrow heel area or trapped debris that may be hiding below the surface.
7. Consider whether the horse has recently changed routine, such as more turnout, less movement, or different bedding.
Common Causes
The most common cause is moisture mixed with dirt and manure around the frog, especially in horses that stand in wet fields or damp bedding for long periods. Thrush often develops in the deeper parts of the hoof, so the outside can look fairly tidy.
Poor airflow around the frog can also play a part, particularly if the hoof has deep grooves or the heel area is tight. In some horses, an overgrown or uneven hoof shape may make it easier for debris to collect.
Less commonly, repeated discomfort can be linked to more significant hoof issues that need a closer look, especially if the horse is sore, the smell is strong, or the hoof doesn't improve with routine care.
What To Do
Keep the hooves clean and dry as far as practical, with regular picking out and a close look at the frog rather than just the outer hoof wall. If the horse is in wet conditions, try to reduce standing time in muddy or dirty areas where you can.
Make sure bedding is kept as clean and dry as possible, and keep an eye on whether the problem is linked to turnout, stable time or a particular foot. A simple daily check can help you spot whether things are getting better or worse.
If the horse's feet are very deep, narrow or difficult to clean, a farrier may be able to suggest routine hoof care that helps reduce the chance of debris being trapped. It's also worth keeping your normal trimming schedule up to date.
When To Contact A Vet
Speak to your vet if the horse is clearly lame, very sore, has swelling above the hoof, or the area becomes increasingly painful, hot or foul-smelling despite routine care. A vet can check whether there is more going on than simple thrush.
It's also sensible to get advice if the hoof looks deeply affected, the horse won't let you examine it, or the problem keeps coming back.
Products That May Help
Keeping on top of mud, moisture and general hoof hygiene can be helpful as part of your normal routine when thrush is a concern. This collection may support that day-to-day care.
Related Questions
Can thrush be present even if the hoof looks clean?
What does thrush smell like in a horse's hoof?
How often should I pick out my horse's hooves in wet weather?
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.