"Why should I listen to you?" Because some random unknown person on the internet does in this case, seem like a much better resource for this, than your farrier. In my experience, there is a group of farriers who just aren't real good at being vets. That would be - all farriers. They are not trained to look into the eye and seek out signs of squamous cell cancer. Or cataracts. Or internal cancer. That's why I don't ask my farrier to diagnose my horse's medical problems. That's also why most farriers usually refuse to give medical advice. Of any type. For example my farrier won't diagnose horses' medical conditions. Ever. No matter who asks him. In fact he works with an excellent lameness vet and he doesn't even profess to have x-ray vision and be able to see inside a horse's foot! After many years and seeing a great deal of this 'it's just flies' or 'he's faking lameness to get out of work' or 'yeah he's got diarrhea but it's no big deal, just give him cider vinegar,' I've designated a group that I call 'Everyone Says.' I've found that 'Everyone Says' tend to assume that everything is 'no big deal' and in fact, they are pretty dang wrong a lot of the time.