Why is my horse’s hoof crack opening and closing when it walks? | arlo.® Atlas
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Overview
If a hoof crack opens and closes as your horse walks, it’s often because the hoof capsule is flexing with movement. That can be normal to a degree, but it can also happen when the crack is in an area that moves a lot, or when the hoof is affected by moisture changes, trimming balance, or a loose shoe if your horse wears one.
It’s worth checking the crack closely so you can tell whether it looks stable and superficial, or whether it’s becoming more active, dirty, sore or deeper.
Things To Check
1. Look at whether the crack is at the toe, quarter or heel, as some areas move more than others when the hoof loads.
2. Check if the crack seems to gap more after exercise, turnout or standing on harder ground.
3. Feel for heat in the hoof and look for any new swelling higher up the leg.
4. See whether there is any sensitivity when you pick out the hoof or press around the area.
5. Check for crumbling horn, a change in hoof shape, or the crack extending upwards or sideways.
6. If your horse is shod, make sure the shoe looks secure and there are no loose clenches, shifted nails or lifted edges.
7. Look at the ground conditions your horse is living on, especially if they’ve been in wet, muddy or very dry conditions recently.
Common Causes
The most common reason is simple hoof flexion. Hooves naturally expand and contract slightly as the horse walks, so a crack may open and close with each step.
Uneven hoof balance or recent trimming can also make a crack move more noticeably, especially if one side of the hoof is carrying more strain.
Moisture changes are another common factor. Wet, dry, then wet conditions can make the horn more prone to splitting or shifting.
If the horse wears shoes, a loose or poorly fitting shoe can sometimes make a crack look more active as the hoof moves.
Less commonly, a deeper crack may be linked with ongoing strain, poor horn quality, or another hoof issue that needs a closer look.
What To Do
Keep the hoof clean and pick it out regularly so you can monitor whether the crack is changing.
Try to reduce exposure to very wet or very dry conditions where possible, since sudden changes in moisture can make hoof cracks more unstable.
Take clear photos every few days in the same light and from the same angle. That makes it much easier to spot if the crack is lengthening or widening.
Avoid overhandling, digging at the crack or applying anything harsh unless you’ve been advised to do so by your farrier or vet.
If the horse is shod, ask your farrier to check whether the shoeing setup or hoof balance may be contributing to the movement in the crack.
When To Contact A Vet
Speak to your vet if the horse looks lame, the crack is deep or spreading quickly, there’s bleeding, heat, swelling or discharge, or the hoof seems painful to handle. It’s also sensible to get advice if a crack keeps worsening despite farrier care, or if you’re unsure whether it has reached sensitive structures.
Products That May Help
If your horse is dealing with cracked hooves, muddy turnout or damp conditions, keeping the hoof area and surrounding environment as clean and manageable as possible may help support your day-to-day care routine.
Related Questions
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Should I box rest a horse with a hoof crack?
Can a farrier stabilise a hoof crack?
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.