Hi Miranda. Yes, it is possible that your horse has thrust and your need to get a vet to see her. Here is some information.
Thrush is the result of an anaerobic bacterial infection of the horse's hooves, though no specific organisms have been identified as the cause of this condition. Affecting the frog (the soft triangle-shaped part of a horse's hoof), thrush infections are usually characterized by a black putty-like material that can be found when cleaning your horse's hooves. Possessing a very foul odor, a thrush infection is easily identified and can cause not only tenderness in your horse's feet, but can also cause mild degrees of lameness.
5 months ago
Last edited at 11:52AM on 7/23/2013
If thrush has gotten deep into her hoof then it's possible, and can develop further into white line. Pick up her foot and clean it out. Does it smell bad and are you scraping black stuff out from between the frog?
Thrush is kind of horsey athlete's foot. It's not bad unless you leave it untreated. Personally I've dealt with thrush infections repeatedly, usually from horses who, well, get their stall really wet really quickly... but it's never been bad. You can always tell because their feet are stinky when you clean them - which you should be doing daily, and both before and after riding or turnout. If a thrush infection is to the point that your horse is limping then you need to call a vet for analysis and a stronger treatment, because there is a risk of White Line disease, which is REALLY bad.
Comment if you determine it's not thrush - it's pretty obvious. Check for heat on the hoof, coronary band, and fetlock as well.
It could be thrush. My horse had navicular which has led to horrible thrush in his hooves! Thrush is the black stinky stuff that is in the hoof, but it grows in the frog on the hoof. You really don't need to spend 20 bucks on a 6 oz bottle of crap that will stain everything (thrush X) ! All you need to do is this: 1) pick out the hooves really well 2) pour just enough hydrogen peroxide on the slit of the frog and in the 'V' canals to barely fill them up 3) hold the hoof up for 15 seconds to allow the peroxide to go deep in and kill the thrush 4) treat every other day until thrush is gone