I wouldnt be inclined to say they never had thrush unless I had picked their feet out daily. That and environment could have been different those years. Two-three years ago we had the worst drought in decades. I never had to worry about thrush. This winter and summer have been unbelievably wet and I've been staying on top of their feet with daily picking and prevention through either ACV, Durasole, or Spectrasan. Their feet have gotten a little thrushy this year because of the crazy rain and mud, especially my pony who is naturally higher heeled and has slightly contracted heels. He is more susceptible to thrush than my yearling.
I didn't say ALL shod horses will get thrush, I just think ime they are more susceptible especially with a crappy shoeing job that leaves their heels contracted. A mare in trimming right now has only been out of shoes for a couple months. When she was first moved to our barn by her new owner, she had the worst deep sulcus thrush is ever seen with severely contracted heels from the shoes. And yet she had so much retained sole that her sole was bulbous. The sole was higher than the hoof wall, which must have been extremely painful. I told her owner, who is great at following directions, to pick her feet every day, spray them with ACV, and apply Rameys goo at least once a week into her sulcus. Within a week all the excess sole had shed off itself(there was seriously about an inch and a half of excess sole) and her sulcus was starting to open up. Now her thrush is almost completely gone and it definitely will be once I slowly take down her high heels, open up her sulcus completely, and get her frog making contact with the ground. The difference already is night and day, just thanks to her owner picking and treating them every day.
ETA: Ignore all the typos. I'm on my iPod haha
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